The number of photons emitted by a monochromatic (single frequency) infrared range finder of power 1 mW and wavelength of 1000 nm, in 0.1 second is x × 1013. The value of x is _________. (Nearest inte

Question

The number of photons emitted by a monochromatic (single frequency) infrared range finder of power 1 mW and wavelength of 1000 nm, in 0.1 second is x × 1013. The value of x is _________. (Nearest integer) (h = 6.63 × 10–34 Js, c = 3.00 × 108 ms–1) 1 mW rFkk 1000 nm rjaxnS/;Z ds ,d o.khZ (,dy vko`fÙk) vojDr ijklekih ls 0.1 lsdsUM esa mRlftZr QksVkWuksa dh la[;k x × 1013 gSA x dk eku gS_________. (fudVre iw.kk±d esa) (h = 6.63 × 10–34 Js, c = 3.00 × 108 ms–1)

Prashant Kotian · Accepted Answer

Correct answer: .. Energy emitted in 0.1 sec s J . sec . 3    = 10-4 J If 'n' photons of  = 1000 nm are emitted, then 10–4 =  hc n 10–4 = 8 10 10 10 . n        n = 5.02 ×1014 = 50.2 ×1013 50 (nearest integer)

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