If the kinetic energy of a free electron doubles, its de-Broglie wavelength changes by the factor 
(1) 12             

(2) 2

(3) 12                

(4) 2

Subtopic:  De-broglie Wavelength |
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The energy that should be added to an electron to reduce its de Broglie wavelength from one nm to 0.5 nm is

(1) Four times the initial energy

(2) Equal to the initial energy

(3) Twice the initial energy

(4) Thrice the initial energy

Subtopic:  De-broglie Wavelength |
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The wavelength of the matter wave is independent of

(1) Mass                 

(2) Velocity

(3) Momentum       

(4) Charge

Subtopic:  De-broglie Wavelength |
 82%
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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 |
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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%
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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 |
 85%
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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 |
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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 |
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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%
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