1.

The number of photons of light having wave number x in 1J of energy source is (Plank's constant=h, velocity of light =c)

Answer»

hcx
hc/X
`x/(hc)`
`1/(hcx)`

Solution :ENERGY of PHOTON `=hv=(hc)/(lamda)` or `hc.barv=hcx`
No. of PHOTONS in `1J=1/(hcx)`


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