Advertisements
Advertisements
प्रश्न
Can X-rays be used for photoelectric effect?
Advertisements
उत्तर
Yes, X-rays can be use for photoelectric effect. Photoelectric effect is the emission of electrons from a metal surface when the frequency of radiation is greater than the threshold frequency of the metal. For photoelectric effect using X-rays, the energy of the incoming X-ray photon should be greater than the work-function of the metal used.
APPEARS IN
संबंधित प्रश्न
A plane electromagnetic wave travels in the vacuum along the 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?
What is the range of the wavelength of the following electromagnetic waves?
(a) Micro waves .
State the approximate range of wavelength associated with infrared rays.
Give one use of microwaves.
Give one use of gamma rays.
Why is exposure to X-rays injurious to health but not exposure to visible light, when both are electromagnetic waves?
The energy of a silver atom with a vacancy in K shell is 25.31 keV, in L shell is 3.56 keV and in M shell is 0.530 keV higher than the energy of the atom with no vacancy. Find the frequency of Kα, Kβ and Lα X-rays of silver.
(Use Planck constant h = 6.63 × 10-34 Js= 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)
A free atom of iron emits Kα X-rays of energy 6.4 keV. Calculate the recoil kinetic energy of the atom. Mass of an iron atom = 9.3 × 10−26 kg.
(Use Planck constant h = 6.63 × 10-34 Js= 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)
Name three radiations and their wavelength range which are invisible and beyond the violet end of the visible spectrum.
Name the part of the electromagnetic spectrum which is:
Suitable for radar systems used in aircraft navigation.
Name the part of the electromagnetic spectrum which is:
Produced by bombarding a metal target with high electrons.
State three properties of infrared radiations similar to that of visible light.
Answer briefly.
What are radio waves?
A car is moving towards a high cliff. The car driver sounds a horn of frequency f. The reflected sound heard by the driver has a frequency 2f. If v be the velocity of sound, then the velocity of the car, in the same velocity units, will be:
Microwaves are electromagnetic waves with frequency in the range of.
If λv, λx and λm Am represents the wavelength of visible light, x-ray and microwaves respectively, then ______.
The ratio of contributions made by the electric field and magnetic field components to the intensity of an EM wave is ______.
Which part of the electromagnetic spectrum is known as the visible spectrum?
How are the electric and magnetic fields oriented in an electromagnetic wave?
What can result from excess ultraviolet exposure?
