What is the relationship between intensity and amplitude?

  • Thread starter Raghav Gupta
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In summary, intensity is defined as power per unit area. It is equal to the square of the amplitude and is calculated by multiplying energy density by the speed of the wave. In the case of an electromagnetic wave, half of the intensity is contributed by the electric field and the other half by the magnetic field. This is demonstrated in NCERT example 8.5. In wave optics, for fringe formation to occur, the size of the light source (s) must be smaller or equal to the distance between two slits (S) divided by the wavelength (λ) over the distance between the source and the slits (d). This can be seen in NCERT example 10.4 (d).
  • #1
Raghav Gupta
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I think basic definition of intensity is power by area.
How intensity is square of the amplitude?
How intensity is energy density times speed of thing?
How in a radiation of EM wave,
Half of the intensity is provided by elec.field and other by magnetic field?
 
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NCERT example 8.5 right?
 
  • #3
AdityaDev said:
NCERT example 8.5 right?
Yeah, I got all the answers of that by some searching.
Can you answer this one,
In wave optics
taking size of light source =s and distance from 2 slits S,
How s/S <= λ/d
for the fringe formation to take place?
 
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  • #4
Size of light source??
 
  • #5
AdityaDev said:
Size of light source??
As in NCERT example 10.4 (d) .
 

1. What is intensity?

Intensity refers to the amount of energy or power per unit area. It is a measure of the strength or magnitude of a physical quantity, such as light, sound, or radiation.

2. How is intensity measured?

The unit of measurement for intensity varies depending on the physical quantity being measured. For example, the intensity of light is measured in watts per square meter (W/m²) while the intensity of sound is measured in decibels (dB).

3. How does intensity affect perception?

The intensity of a stimulus can greatly affect how it is perceived by an individual. For example, a bright light may be perceived as blinding while a soft light may be perceived as soothing. Similarly, a loud sound may be perceived as annoying while a soft sound may be perceived as calming.

4. Can intensity be harmful?

Yes, high levels of intensity can be harmful to living organisms. For example, exposure to high intensity UV radiation from the sun can cause sunburns and increase the risk of skin cancer. Similarly, exposure to high intensity noise can lead to hearing loss.

5. How can intensity be controlled?

Intensity can be controlled by adjusting the source of the physical quantity. For example, the intensity of light can be controlled by adjusting the brightness of a light source, while the intensity of sound can be controlled by adjusting the volume of a speaker. Additionally, protective measures such as wearing sunglasses or earplugs can also help to control intensity levels.

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