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Q. No.

A 200 W sodium street lamp emits yellow light of wavelength 0.6 μm. Assuming it to be 25% efficient in converting electrical energy to light, the number of photons of yellow light it emits per second is

1. 1.5×1020

2. 6×1018

3. 62×1020

4. 3×1019

Q10:
 71% From NCERT AIPMT - 2012
Subtopic:  Photoelectric Effect: Experiment |
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An α-particle moves in a circular path of radius 0.83 cm in the presence of a magnetic field of 0.25 Wb/m2. The de-Broglie wavelength associated with the particle will be :

1. 1 Ao
2. 0.1 Ao
3. 10 Ao
4. 0.01 Ao

Q11:
 57% From NCERT AIPMT - 2012
Subtopic:  De-broglie Wavelength |
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In the Davisson and Germer experiment, the velocity of electrons emitted from the electron gun can be increased by:

1. increasing the filament current.
2. decreasing the filament current.
3. decreasing the potential difference between the anode and filament.
4. increasing the potential difference between the anode and filament.

Q14:
 74% From NCERT AIPMT - 2011
Subtopic:  Davisson & Germer Experiment |
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A radioactive nucleus of mass M emits a photon of frequency ν and the nucleus will recoil. The recoil energy will be

1.  h2ν22Mc2

2.  zero

3.  hνc2M

4.  c2Mhν

Q15:
 69% From NCERT AIPMT - 2011
Subtopic:  De-broglie Wavelength |
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In the photoelectric emission process from a metal of work function 1.8 eV, the kinetic energy of most energetic electrons is 0.5 eV. The corresponding stopping potential is:

1.  1.3 V

2.  0.5 V

3.  2.3 V

4.  1.8 V

Q16:
 74% From NCERT AIPMT - 2011
Subtopic:  Photoelectric Effect: Experiment |
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Light of two different frequencies, whose photons have energies of 1 eV and 2.5 eV respectively, illuminates a metallic surface whose work function is 0.5 eV successively. The ratio of maximum speeds of emitted electrons will be:

1.  1:2

2.  1:1

3.  1:5

4.  1:4

Q17:
 74% From NCERT AIPMT - 2011
Subtopic:  Einstein's Photoelectric Equation |
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Electrons used in an electron microscope are accelerated by a voltage of 25 kV. If the voltage is increased to 100 kV, then the de-Broglie wavelength associated with the electrons would

1.  decrease by 2 times

2.  decrease by 4 times

3.  increase by 4 times

4.  increase by 2 times

Q18:
 73% From NCERT AIPMT - 2011
Subtopic:  De-broglie Wavelength |
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A source S1 is producing 1015 photons per sec of wavelength 5000 Å. Another source S2 is producing 1.02×1015 photons per second of wavelength 5100 Å. Then, (power of S2)/(power of S1) is equal to

1. 1.00

2. 1.02

3. 1.04

4. 0.98

Q20:
 77% From NCERT AIPMT - 2010
Subtopic:  Photoelectric Effect: Experiment |
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The potential difference that must be applied to stop the fastest photoelectrons emitted by a nickel surface, having work function 5.01 eV, when ultraviolet light of 200 nm falls on it, must be

1. 2.4 V

2. -1.2 V

3. -2.4 V

4. 1.2 V

Q21:
 56% From NCERT AIPMT - 2010
Subtopic:  Einstein's Photoelectric Equation |
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Monochromatic light of wavelength 667 nm is produced by a helium-neon laser. The power emitted is 9mW. The number of photons arriving per second on an average at a target irradiated by this beam are
1. 9 x 1017

2. 3 X 1016

3. 9 x 1015

4. 3 X 1019

Q23:
 78% From NCERT AIPMT - 2009
Subtopic:  Photoelectric Effect: Experiment |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology
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