The energy of a photon of wavelength λ is given by
1. hλ                      

2. chλ

3. λ/hc                   

4.  hc/λ

Subtopic:  De-broglie Wavelength |
 93%
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The rest mass of the photon is

(1) 0

(2)

(3) Between 0 and

(4) Equal to that of an electron

Subtopic:  Particle Nature of Light |
 80%
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The momentum of a photon of energy hv will be

(1) hv     

(2) hv/c

(3) hvc     

(4) h/v

Subtopic:  De-broglie Wavelength |
 85%
From NCERT
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If the momentum of a photon is p, then its frequency is

(1) phc           

(2) pch

(3) mhc           

(4) mch

where m is the rest mass of the photon

Subtopic:  De-broglie Wavelength |
 86%
From NCERT
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An AIR station is broadcasting the waves of wavelength 300 metres. If the radiating power of the transmitter is 10 kW, then the number of photons radiated per second is

(1) 1.5×1029             

(2) 1.5×1031

(3) 1.5×1033             

(4) 1.5×1035

Subtopic:  Electron Emission |
 76%
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The energy of a photon is E = hv and the momentum of photon p=hλ, then the velocity of photon will be

(1) E/p                     

(2) Ep

(3)  EP2                 

(4) 3×108 m/s

Subtopic:  Einstein's Photoelectric Equation | Particle Nature of Light | De-broglie Wavelength |
 61%
From NCERT
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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%
From NCERT
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What is the momentum of a photon in an X-ray beam of 10-10 meter wavelength?

1. \(1.5 \times 10^{-23} \mathrm{~kg}-\mathrm{m} / \mathrm{sec}\)
2. \(6.6 \times 10^{-24} \mathrm{~kg}-\mathrm{m} / \mathrm{sec}\)
3. \(6.6 \times 10^{-44} \mathrm{~kg}-\mathrm{m} / \mathrm{sec}\)
4. \(2.2 \times 10^{-52} \mathrm{~kg}-\mathrm{m} / \mathrm{sec}\)

Subtopic:  De-broglie Wavelength |
 90%
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The energy of a quanta of frequency 1015 Hz and h=6.6×10-34 J-sec will be:

1. 6.6×10-19 J

2.6.6×10-12 J

3. 6.6×10-49 J

4.6.6×10-41 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%
From NCERT
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