Monochromatic light of frequency 6.0×1014 Hz is produced by a laser. The power emitted is 2.0×10-3 W. How many photons per second, on average, are emitted by the source?

1. 6×10152. 5×10143. 6×10144. 5×1015

Subtopic:  Particle Nature of Light |
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The work function of caesium is 2.14 eV. The threshold frequency for caesium is:

1. 5.03×1012 Hz2. 6.12×1014 Hz3. 5.16×1014 Hz4. 6.51×1012 Hz

Subtopic:  Particle Nature of Light |
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