What is initial speed in physics?
speed is equal to distance covered over specified time. to find the initial speed the equation of (D=ViT-1/2AT^2) A=acceleration T=time Vi=initial vilocity D=displacement just plug in the numbers. or if you are given a graph than look at the instantaneous validity in the beginning (tangent to initial point) 6.5K views View upvotes David Vanderschel
What is the equation for intensity?
The general formula for intensity is I = P/A where I stands for intensity, P stands for power, and A stands for area. Power and area are measured differently for different quantities, so intensity is measured differently depending on the type of quantity being studied.
What is the definition of intensity?
2 the quality or state of being forceful (as in expression) the intensity of the actor's performance had theatergoers on the edge of their seats Synonyms for intensity aggressiveness, assertiveness, emphasis, fierceness, forcefulness, intenseness, vehemence, vigorousness, violence Near Antonyms for intensity ambiguity, equivocation delicacy,
What does intensity mean?
intensity ( ɪnˈtɛnsɪtɪ) n, pl -ties 1. the state or quality of being intense 2. extreme force, degree, or amount 3. (General Physics) physics a. a measure of field strength or of the energy transmitted by radiation. See radiant intensity, luminous intensity
What is intensity in modern physics?
Intensity is the quantity of energy the wave conveys per unit time across a surface of unit area, and it is also equivalent to the energy density multiplied by the wave speed. It is generally measured with units of watts per square meter. Intensity will depend on the strength and amplitude of a wave.
What is intensity of light physics?
The term intensity is used to describe the rate at which light spreads over a surface of a given area some distance from a source. The intensity varies with the distance from the source and the power of the source.
How do you find intensity in physics?
The intensity of a wave is defined as I=P4πr2 I = P 4 π r 2 . Intensity: Power output per unit area. The standard unit for intensity is Watts per square meters (Wm2) ( W m 2 ) . Power: Energy per unit time.; in this case the energy produced by the source of the wave.
What is intensity and frequency?
if you consider light is wave, intensity is related to light radiation energy and frequency is the number of waves per second. if you consider light is particle, each particle in the light radiation is called photon.
What is the SI unit of intensity?
Intensity is denoted by “I”. The S.I unit of intensity is Watt per square meter ( W / m 2 ) o r ( kgs - 3 ) .
What is called intensity of light?
Luminous intensity, the quantity of visible light that is emitted in unit time per unit solid angle. The unit for the quantity of light flowing from a source in any one second(the luminous power, or luminous flux) is called the. lumen. The lumen is evaluated with reference to visual sensation.
What is the basic formula of intensity?
I = P/AThe general formula for intensity is I = P/A where I stands for intensity, P stands for power, and A stands for area. Power and area are measured differently for different quantities, so intensity is measured differently depending on the type of quantity being studied.
What is intensity of waves?
The intensity (I) of a wave is defined as the rate at which it transfers energy divided by the area over which the energy is spread. In other words, intensity is the rate of energy flow per unit area.
What is intensity a measure of?
Intensity is an objective measure of the time-averaged power density of a wave at a particular location. The SI unit of intensity is the watt per square meter .
Is frequency an intensity?
Frequency: refers to the frequency of exercise undertaken or how often you exercise. Intensity: refers to the intensity of exercise undertaken or how hard you exercise.
Is frequency and intensity same?
intensity is the number of photons incident in a second on a unit area ( more accurately it is the energy per unit area per unit time), while frequency refers to the frequency of the photon when referred to as a wave which is the number of waves per second.
Is energy and intensity same?
Intensity means a greater number of photons per second per square meter. Intensity is measured in Joules per second per metre squared, and measures the intensity of the wave. Energy is just Joules alone, and measures the energy of the particle associated with the wave - if there is one.
What is intensity of light formula?
Using L for luminosity, the intensity of light formula becomes I=LA I = L A . Because light waves spread in all directions, to accurately calculate light intensity, the denominator in the formula must be the surface area of a sphere. In fact, most electromagnetic calculations are done over a sphere.
What is intensity of light in photoelectric effect?
The energy in the light wave (its intensity is in J/m2s. ) must be transferred to the kinetic energy of the emitted electrons. As there is the change in the frequency of the light wave it should emit the number of electrons that break away from the metal.
What determines the intensity of light?
In the wave picture of light, intensity of light is determined by the square of the amplitude of the wave.
What is the intensity and brightness of light?
Intensity is the power per unit area; it is a physical quantity. Brightness involves how the human visual system perceives light, and it is not a physical quantity.
What is light intensity in physics?
Intensity is the ratio of power to unit area. Light power is measured in Watts, so, in physics, light intensity is measured in Watts per square meter.
What is the correct formula for the intensity?
The general formula for intensity is I = P/A where I stands for intensity, P stands for power, and A stands for area. Power and area are measured d...
What is intensity of sound in physics?
In physics, sound intensity is the magnitude of sound that penetrates a given area. It is customary to discuss the sound intensity level, which is...
How is intensity measured in physics?
In physics, intensity is a measure of time-averaged power over area. The most common units for intensity are Watts per meter squared or Watts per c...
What is intensity measured in a circuit?
Instead, amplitude measurements are almost always used as the raw data in some computation. When done by an electronic circuit (like the circuits in a telephone that connect to a microphone) the resulting value is called intensity.
How does magnitude scale work?
With these scales, one measures the size of the earthquake as expressed by the seismic wave amplitude (amount of shaking at a point distant from the earthquake) rather than the intensity or degree of destructiveness. Most magnitude scales have a logarithmic basis, so that an increase in one whole number corresponds to an earthquake 10 times stronger than one indicated by the next lower number. This translates into an approximate 30-fold increase in the amount of energy released. Thus magnitude 5 represents ground motion about 10 times that of magnitude 4, and about 30 times as much energy released. A magnitude 5 earthquake represents 100 times the ground motion and 900 times the energy released of a magnitude 3 earthquake.
How loud is 10 phon?
One phon is the loudness of a 1 dB, 1,000 Hz sound; 10 phon is the loudness of a 10 dB, 1,000 Hz sound; and so on. Cupping ones hand behind one's ear will result in an intensity increase of 6 to 8 dB. Asking someone to speak up usually results in an increase of about 10 dB on the part of the speaker.
What is the LI of a periodic signal?
Given a periodic signal of any sort, its intensity level ( LI) in bel [B] is defined as the base ten logarithm of the ratio of its intensity to the intensity of a reference signal. Since this unit is a bit large for most purposes, it is customary to divide the bel into tenths or decibels [dB]. The bel is a dimensionless unit.
What properties of sound waves can be measured?
intensity and pressure. The amplitude of a sound wave can be measured much more easily with pressure (a bulk property of a material like air) than with displacement (the displacement of the submicroscopic molecules that make up air).
How is amplitude measured?
The amplitude of a sound wave can be quantified in several ways, all of which are a measure of the maximum change in a quantity that occurs when the wave is propagating through some region of a medium.
What are the two parts of kinetic energy?
Let's work on the kinetic energy and see where it takes us. It has two important parts — mass and velocity.
What does intensity mean in photometry?
In photometry and radiometry intensity has a different meaning: it is the luminous or radiant power per unit solid angle. This can cause confusion in optics, where intensity can mean any of radiant intensity, luminous intensity or irradiance, depending on the background of the person using the term.
How to find the intensity of a vector?
Intensity can be found by taking the energy density (energy per unit volume) at a point in space and multiplying it by the velocity at which the energy is moving. The resulting vector has the units of power divided by area (i.e., surface power density ).
What is the most common unit used to measure intensity?
There are other intensity-related units in use, too. The most common is the decibel. For example, a 90 decibel sound level corresponds to an intensity of (This quantity is not much power per unit area considering that 90 decibels is a relatively high sound level.
How does intensity go up when the amplitude doubles?
The intensity goes up by a factor of 4 when the amplitude doubles. This answer is a little disquieting. The two individual waves each have intensities of yet their sum has an intensity of which may appear to violate conservation of energy. This violation, of course, cannot happen. What does happen is intriguing. The area over which the intensity is is much less than the area covered by the two waves before they interfered. There are other areas where the intensity is zero. The addition of waves is not as simple as our first look in Chapter 16.10 Superposition and Interference suggested. We actually get a pattern of both constructive interference and destructive interference whenever two waves are added. For example, if we have two stereo speakers putting out each, there will be places in the room where the intensity is other places where the intensity is zero, and others in between. Figure 2 shows what this interference might look like. We will pursue interference patterns elsewhere in this text.
When two identical waves have equal amplitudes, the resulting wave has an amplitude of?
We know from Chapter 16.10 Superposition and Interference that when two identical waves, which have equal amplitudes interfere perfectly constructively, the resulting wave has an amplitude of Because a wave’s intensity is proportional to amplitude squared, the intensity of the resulting wave is four times as great as in the individual waves.
Does decreasing the area increase the intensity of a fire?
Decreasing the area increases the intensity considerably. The intensity of the concentrated sun light could even start a fire.
What does intensity mean in science?
The term "intensity" has many meanings, and can be misleading depending on who interprets the word. Intensity here probably is intended to mean energy intensity - as in how luminous/energetic that light is. I feel like when your professor says "number of photons per second", they are referring to the frequency of the light wave.
How to find the energy of a wave?
The *energy of a typical wave (like a real ocean wave) is given by the square of its amplitude. But in quantum mechanics however, the probability density of a wave function is given by the amplitudes square. A quantum wave function is NOT the same as a typical wave as we know it in the macroscopic world, though there are similarities mathematically. A wave function is a probability distribution. Here, intensity means frequency of observing the particle in a particular place (probability of finding the particle in a particular place.)
Is a quantum wave the same as a typical wave?
A quantum wave function is NOT the same as a typical wave as we know it in the macroscopic world, though there are similarities mathematically. A wave function is a probability distribution. Here, intensity means frequency of observing the particle in a particular place (probability of finding the particle in a particular place.) Share.
Is irradiance a natural measure?
From these, the irradiance is the most natural measure, and (once you put in the suitable constants) all three versions of it are equivalent.
What scale is used to measure intensity?
This type of scale is sometimes referred to as a logarithmic scale. The scale for measuring intensity is the decibel scale .
What unit is used to measure the intensity of a sound wave?
Typical units for expressing the intensity of a sound wave are Watts/meter 2. As a sound wave carries its energy through a two-dimensional or three-dimensional medium, the intensity of the sound wave decreases with increasing distance from the source. The decrease in intensity with increasing distance is explained by the fact ...
Why are two sounds with the same intensity but different frequencies not perceived to have the same loudness?
Because of the human ear's tendency to amplify sounds having frequencies in the range from 1000 Hz to 5000 Hz, sounds with these intensities seem louder to the human ear.
How does frequency affect sound?
As mentioned in the previous paragraph, even the frequency will affect our perception of the loudness of a sound. For instance, a 100 Hz sound at 60 dB will not sound as loud as a 1000 Hz sound at 60 deciBel. Fletcher–Munson curves or equal loudness curves are often used to demonstrate the perceived loudness of a sound for a given frequency. Use the widget to investigate the effect of the frequency upon the perceived loudness and to view the equal loudness curves.
What is the decibel level of a mosquito buzz?
1. A mosquito's buzz is often rated with a decibel rating of 40 dB. Normal conversation is often rated at 60 dB. How many times more intense is normal conversation compared to a mosquito's buzz?
What is the energy of a sound wave?
The amount of energy that is transported past a given area of the medium per unit of time is known as the intensity of the sound wave. The greater the amplitude of vibrations of the particles of the medium, the greater the rate at which energy is transported through it, and the more intense that the sound wave is. Intensity is the energy/time/area; and since the energy/time ratio is equivalent to the quantity power, intensity is simply the power/area.
What is the relationship between energy and distance?
The mathematical relationship between intensity and distance is sometimes referred to as an inverse square relationship .
Intensity vs. Amplitude
Intensity and Displacement
- For simple mechanical waves like sound, intensity is related to the density of the medium and the speed, frequency, and amplitude of the wave. This can be shown with a long, horrible, calculation. If you don't care to see the sausage being made below, jump to the equationjust before the vibrant table. Start with the definition of intensity. Replace...
Intensity and Pressure
- The amplitude of a sound wave can be measured much more easily with pressure (a bulk property of a material like air) than with displacement (the displacement of the submicroscopic molecules that make up air). Here's a quick and dirty derivation of a more useful intensity-pressure equation from an effectively useless intensity-displacement equation. Start with the equation that relates …
Intensity and Density
- The density changes in a medium associated with a sound wave are directly proportional to the pressure changes. The relationship is as follows… This looks similar to the Newton-Laplace equation for the speed of sound in an ideal gas but it's missing the heat capacity ratio γ(gamma). Why? Assuming the first equation is the right one, solve it for ∆ρ. Take the pressure amplitude-di…
Levels
- WRITE THIS PART What is a level? Types of levels. Given a periodic signal of any sort, its intensity level (LI) in bel [B] is defined as the base ten logarithm of the ratio of its intensity to the intensity of a reference signal. Since this unit is a bit large for most purposes, it is customary to divide the bel into tenths or decibels[dB]. The bel is a dimensionless unit. When the signal is a sound wave…
Hearing
- loudness
- locating the source of sound
- The human ear can distinguish some…
- fish