Advertisements
Advertisements
प्रश्न
Define the term "Intensity" in the photon picture of electromagnetic radiation.
Advertisements
उत्तर
The intensity I is defined as the total amount of energy falling on a given surface/Region per unit time 'rand per unit area A:
If the total energy emitted = nhv
Then, I = `(nhν)/(At)`
APPEARS IN
संबंधित प्रश्न
Identify the part of the electromagnetic spectrum which is:
produced by bombarding a metal target by high speed electrons.
A plane electromagnetic wave travels in vacuum along z-direction. What can you say about the directions of its electric and magnetic field vectors? If the frequency of the wave is 30 MHz, what is its wavelength?
The wavelengths for the light of red and blue colours are roughly 7.8 × `10^7` m and 4.8 × `10^7` m respectively.
(a) Which colour has the greater speed in vacuum?
(b) Which colour has the greater speed in glass?
Can X-rays be polarised?
X-ray and visible light travel at the same speed in vacuum. Do they travel at the same speed in glass?
Consider a photon of continuous X-ray and a photon of characteristic X-ray of the same wavelength. Which of the following is/are different for the two photons?
Name the radiation which can be detected by thermopile.
Answer briefly.
Name the most harmful radiation entering the Earth's atmosphere from outer space.
Identify the electromagnetic wave whose wavelength range is from about 10-12 m to about 10-8 m. Write one use of this.
Assertion (A): Ultraviolet radiations is scattered more as compared to the microwave radiations.
Reason (R): Wavelength of ultraviolet radiation is more than the wavelength of microwave radiation.
