If a monochromatic light of frequency 6.0×1014 Hz is produced by a so

1.	If a monochromatic light of frequency 6.0×1014 Hz is produced by a source and the power emitted is 2.0×10-3W, then the number of photons emitted per secnod by the source is(a) 3×1010 (b) 5×1015(c) 7×1012 (d) 9×1012
Answer» Correct Option (b) 5×10¹⁵ Explanation : An energy, E = hv = 6.63×10^–34x 6.05×10¹⁴ = 3.98×10^–19J Now, number of photons emitted per second n = p/E = 2.0 x 10^-3/3.98 x 10^-19J = 5 x 10¹⁵photons per second

If a monochromatic light of frequency 6.0×1014 Hz is produced by a source and the power emitted is 2.0×10-3W, then the number of photons emitted per secnod by the source is(a) 3×1010 (b) 5×1015(c) 7×1012 (d) 9×1012

Answer»

Correct Option (b) 5×10¹⁵

Explanation :

An energy,

E = hv = 6.63×10^–34x 6.05×10¹⁴

= 3.98×10^–19J

Now, number of photons emitted per second n = p/E

= 2.0 x 10^-3/3.98 x 10^-19J = 5 x 10¹⁵photons per second

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If a monochromatic light of frequency 6.0×1014 Hz is produced by a source and the power emitted is 2.0×10-3W, then the number of photons emitted per secnod by the source is(a) 3×1010 (b) 5×1015(c) 7×1012 (d) 9×1012

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