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 |
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The spectrum of radiation 1.0 x 1014 Hz is in the infrared region. The energy of one photon of this in joules will be:

1. 6.62×10-48
2. 6.62×10-20
3. 6.623×10-28
4. 3×6.62×10-28

Subtopic:  Particle Nature of Light |
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A helium-neon laser produces monochromatic light of a wavelength of 667 nm. The power emitted is 9 mW. The average number of photons arriving per second on average at a target irradiated by this beam is:

1. 9×1017

2. 3×1016

3. 9×1015

4. 3×1019

Subtopic:  Particle Nature of Light |
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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 the ratio of the power of S2 to the power of S1 is equal to:

1. 1.00

2. 1.02

3. 1.04

4. 0.98

Subtopic:  Particle Nature of Light |
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A 200 W sodium street lamp emits yellow light of wavelength 0.6 μm. If it is 25% efficient in converting electrical energy to light, how many photons of yellow light does it emit per second?

1. 1.5×1020

2. 6×1018

3. 62×1020

4. 3×1019

Subtopic:  Particle Nature of Light |
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Monochromatic light of frequency 6.0×1014 Hz is produced by a laser. The power emitted is 2×10-3 W. What will be the average number of photons emitted by the source per second?

1. 5×1015

2. 5×1016

3. 5×1017

4. 5×1014

Subtopic:  Particle Nature of Light |
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