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The number of photons emitted by a monoc...

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" xx 10^(13)` . The value of r is . (Nearest integer)
`(h=6.63 xx10^(-34) Js, c= 3.00 xx 10^(8) ms^(-1))`

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