Wavelength of a 1 keV photon is 1.24×10-9m. What is the frequency of 1 MeV photon?
1. 1.24×1015 Hz
2. 2.4×1020 Hz
3. 1.24×1018 Hz
4. 2.4×1023 Hz
What is the momentum of a photon having frequency 1.5×1013 Hz?
(a) 3.3×10-29 kg m/s (b) 3.3×10-34 kg m/s
(c) 6.6×10-34 kg m/s (d) 6.6×10-30 kg m/s
The energy of a photon of light of wavelength 450 nm is
(1) 4.4×10-19 J
(2) 2.5×10-19 J
(3) 1.25×10-17 J
(4) 2.5×10-17 J
Which of the following is true for photon
(1) E=hcλ
(2) E=12mu2
(3) p=E2v
(4) E=12mc2
Einstein's photoelectric equation states that Ek=hν−ϕ. In this equation Ek refers to:
1. | kinetic energy of all the emitted electrons |
2. | mean kinetic energy of the emitted electrons |
3. | maximum kinetic energy of the emitted electrons |
4. | minimum kinetic energy of the emitted electrons |
Kinetic energy with which the electrons are emitted from the metal surface due to photoelectric effect is
(1) Independent of the intensity of illumination
(2) Independent of the frequency of light
(3) Inversely proportional to the intensity of illumination
(4) Directly proportional to the intensity of illumination
The threshold wavelength for photoelectric emission from a material is 5200 Å. Photo-electrons will be emitted when this material is illuminated with monochromatic radiation from :
(1) 50-watt infrared lamp
(2) 50-watt ultraviolet lamp
(3) 1-watt ultraviolet lamp
(4) Both (2) and (3)
The threshold frequency of a metal is 1015 Hz. When light with a wavelength λ=4000 A˚ is incident on its surface, which of the following statements is correct?
1. | No photoelectric emission occurs. |
2. | Photoelectrons are emitted with zero velocity. |
3. | Photoelectrons are emitted at a speed of 10^3 m/s. |
4. | Photoelectrons are emitted at a speed of 10^3 m/s. |
Einstein got Nobel prize on which of the following works
(1) Mass-energy relation
(2) Special theory of relativity
(3) Photoelectric equation
(4) (a) and (b) both