Question

A 10 W bulb emits light of 662.6 nm. The total number of photons emitted by the bulb in 10 min is ?

Answer 1

Answer:

power of the bulb = 100 watt

100Js−1

Energy of one photon E = hv = hc/λ

6.626×10−34Js×3×108ms−1400×10−9m

4.969×10−19J

number of photons emitted

100Js−14.969×10−19J=2.012×1020s−1

Explanation:

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Answer 2

Answer:

power of the bulb = 100 watt

100Js−1

Energy of one photon E = hv = hc/λ

=6.626×10−34Js×3×108ms−1400×10−9m

=4.969×10−19J

number of photons emitted

=100Js−14.969×10−19J

=2.012×1020s−1

A 10 W bulb emits light of 662.6 nm. The total number of photons emitted by the bulb in 10 min is 2.012×1020s−1