A laser light of wavelength 660 nm is used to weld Retina detachment. If a laser pulse of width 60 ms and power 0.5 kW is used the approximate number of photons in the pulse are - [JEE Online 09-04-2017] |
[Take Planck's constant \[h=6.62\,\times {{10}^{-34}}Js\]] |
A) \[{{10}^{22}}\]
B) \[{{10}^{19}}\]
C) \[{{10}^{20}}\]
D) \[{{10}^{18}}\]
Correct Answer: C
Solution :
[c] |
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