CUET Preparation Today
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 an average, are emitted by the source? |
5.0 ×1015 5.50 ×1013 10.0 ×1012 5.50 ×1015 |
5.0 ×1015 |
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