The approximate wavelength of a photon of energy 2.48 eV is 
(1) 500 Å                   

(2) 5000 Å

(3) 2000 Å                   

(4) 1000 Å

Subtopic:  De-broglie Wavelength |
 80%
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What is the momentum of a photon in an \(X\text-\)ray beam of \(10^{-10}\) meter wavelength?
1. \(1.5 \times 10^{-23}~\text{kg-m/s}\)
2. \(6.6 \times 10^{-24}~\text{kg-m/s}\)
3. \(6.6 \times 10^{-44}~\text{kg-m/s}\)
4. \(2.2 \times 10^{-52}~\text{kg-m/s}\)
Subtopic:  De-broglie Wavelength |
 90%
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The energy of a quanta of frequency \(10^{15}\) Hz and \(h = 6.6 \times 10^{-34}~\text{J-s}\) will be:
1. \(6.6\times 10^{-19}~\text{J}\)
2. \(6.6\times 10^{-12}~\text{J}\)
3. \(6.6\times 10^{-49}~\text{J}\)
4. \(6.6\times 10^{-41}~\text{J}\)

Subtopic:  Particle Nature of Light |
 91%
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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%
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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%
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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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