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The photon energy, in eV, for electromag...

The photon energy, in eV, for electromagnetic waves of wavelength 40 m is

A

`3 xx 10^(-8)` eV

B

`3.1 xx 10^(-8)` eV

C

`3.2 xx 10^(-8)` eV

D

`3.3 xx 10^(-8)` eV

Text Solution

Verified by Experts

The correct Answer is:
B
`E = (bc)/( lambda) = ( 6.6 xx 10^(-34) xx 3 xx 10^7)/( 40) J`
`E = (6.6 xx 10^(-34) xx 3 xx 10^7) /( 40 xx 1.6 xx 10^(-19) ) "eV" = (19.8 xx 10^(-7) )/( 64)`
`rArr E = 3.1 xx 10^(-1) "eV"`
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