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

Subtopic:  Particle Nature of Light | De-broglie Wavelength |
 70%
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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

Subtopic:  Particle Nature of Light |
 81%
From NCERT
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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

Subtopic:  De-broglie Wavelength |
 78%
From NCERT
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Which of the following is true for photon 
(1) E=hcλ         

(2) E=12mu2

(3) p=E2v         

(4) E=12mc2

Subtopic:  Particle Nature of Light |
 91%
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Einstein's photoelectric equation states that \(E_k=h \nu -\phi.\) In this equation \(E_k\) 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
Subtopic:  Einstein's Photoelectric Equation |
 87%
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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

Subtopic:  Photoelectric Effect: Experiment |
 77%
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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)

Subtopic:  Electron Emission |
 60%
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Threshold frequency for a metal is 1015 Hz. Light of λ=4000 A0 falls on its surface. Which of the following statements is correct

(1) No photoelectric emission takes place

(2) Photo-electrons come out with zero speed

(3) Photo-electrons come out with 103 m/sec speed

(4) Photo-electrons come out with 105 m/sec speed

Subtopic:  Electron Emission |
 71%
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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

Subtopic:  Einstein's Photoelectric Equation |
 61%
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The photo-electrons emitted from a surface of sodium metal are such that 

(1) They all are of the same frequency

(2) They have the same kinetic energy

(3) They have the same de Broglie wavelength

(4) They have their speeds varying from zero to a certain maximum

Subtopic:  Electron Emission |
 64%
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