A 50 watt bulb emits monochromatic red light of wavelength of 795 nm. The number of photons emitted per second by the bulb is x × 1020. The value of x is ……………………… . (Nearest integer) [Given : h = 6.6

Question

A 50 watt bulb emits monochromatic red light of wavelength of 795 nm. The number of photons emitted per second by the bulb is x × 1020. The value of x is ……………………… . (Nearest integer) [Given : h = 6.63 × 10–34 Js and c = 3.0 × 108 ms–1] ,d 50 okWV dk cYc 795 nm rjaxnS/;Z dk ,do.khZ yky izdk'k mRlftZr djrk gSA cYc }kjk izfr lsdsUM mRlftZr QksVkWuksa dh la[;k x × 1020 gSA x dk eku gS ……………………… . (fudVre iw.kk±d esa) [fn;k x;k gS % h = 6.63 × 10–34 Js rFkk c = 3.0 × 108 ms–1]

Prashant Kotian · Accepted Answer

Correct answer: .. Power = 120 J/sec. E =      hc n 120 =                34 10 10 . 10 120 n = 5558.9 × 1017 = 5.5589 × 1020

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