A particle of mass M at rest decays into two particles of masses m1 and m2, having non-zero velocities. The ratio of the de-Broglie wavelengths of the particles, λ1λ2is

(a) m1/m2              (b) m2/m1
(c) 1.0                   (d) m2/m1

Subtopic:  De-broglie Wavelength |
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A photon and an electron have equal energy E, then λphoton/λelectron is proportional to

(1) E                     

(2) 1/E
(3) 1/E                       

(4) Does not depend upon E

Subtopic:  De-broglie Wavelength |
 60%
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A photon of 1.7×10-13 Joules is absorbed by a material under special circumstances. The correct statement is:

1. Electrons of the atom of absorbed material will go the higher energy states

2. Electron and positron pair will be created

3. Only positron will be produced

4. Photoelectric effect will occur and electron will be produced

Subtopic:  Electron Emission |
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In a photoemissive cell with executing wavelength λ, the fastest electron has speed v. If the exciting wavelength is changed to 3λ/4, the speed of the fastest emitted electron will be 
(a) v3/41/2                              (b) v4/31/2
(c) Less than v4/31/2               (d) Greater than v4/31/2

Subtopic:  Photoelectric Effect: Experiment |
 55%
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The ratio of de-Broglie wavelengths of molecules of hydrogen and helium which are at temperature 27 °C and 127 °C respectively is
(1) 12               

(2) 38
(3) 83             

(4) 1

Subtopic:  De-broglie Wavelength |
 78%
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The ratio of de-Broglie wavelength of a α-particle to that of a proton being subjected to the same magnetic field so that the radii of their path are equal to each other assuming the field induction vector B is perpendicular to the velocity vectors of the α-particle and the proton is
(1) 1                     

(2) 14
(3) 12                   

(4) 2

Subtopic:  De-broglie Wavelength |
 62%
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Which of the following figure represents the variation of particle momentum and the associated de-Broglie wavelength?

1. 

2. 

3. 

4. 

Subtopic:  De-broglie Wavelength |
 81%
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The stopping potential as a function of the frequency of the incident radiation is plotted for two different photoelectric surfaces A and B. The graphs show that work function of A is 

(1) Greater than that of B
(2) Smaller than that of B
(3) Equal to that of B
(4) No inference can be drawn about their work functions from the given graphs

Subtopic:  Photoelectric Effect: Experiment |
 77%
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The graph between intensity of light falling on a metallic plate (I) with the current (i) generated is

Subtopic:  Photoelectric Effect: Experiment |
 75%
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For a photoelectric cell the graph showing the variation of cut of voltage (V0) with frequency (v) of incident light is best represented by

Subtopic:  Photoelectric Effect: Experiment |
 75%
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