Advertisements
Advertisements
प्रश्न
What is the photoelectric effect?
उत्तर
The ejection of electrons from a metal plate when illuminated by light or any other electromagnetic radiation of a suitable wavelength (or frequency) is called the photoelectric effect.
APPEARS IN
संबंधित प्रश्न
When a metallic surface is illuminated with radiation of wavelength λ, the stopping potential is V. If the same surface is illuminated with radiation of wavelength 2λ, the stopping potential is `"V"/4`. The threshold wavelength for the metallic surface is
In photoelectric emission, a radiation whose frequency is 4 times threshold frequency of a certain metal is incident on the metal. Then the maximum possible velocity of the emitted electron will be
If the mean wavelength of light from sun is taken as 550 nm and its mean power as 3.8 × 1026 W, then the average number of photons received by the human eye per second from sunlight is of the order of
Give the definition of intensity of light according to quantum concept and its unit.
Explain the quantum concept of light.
Obtain Einstein’s photoelectric equation with the necessary explanation.
Give the applications photocell.
How many photons per second emanate from a 50 mW laser of 640 nm?
How many photons of frequency 1014 Hz will make up 19.86 J of energy?
A 3310 Å photon liberates an electron from a material with energy 3 × 10−19 J while another 5000 Å photon ejects an electron with energy 0.972 × 10−19 J from the same material. Determine the value of Planck’s constant and the threshold wavelength of the material.
