The value of Planck's constant is `6.63 xx 10^-34 Js`. The velocity of light is `3 xx 10^8 m//sec`. Which value is closest to the wavelength of quantum of light with frequency of `8 xx 10^15 sec^-1` ?

Options

A. `2 xx 10^-25 nm`
B. `5 xx 10^-18 nm`
C. `4 nm`
D. `3 xx 10^-7 nm`.

Answer

C

Explanation

( c) Frequency `= ( c)/(lamda) = (3 xx 10^8 ms^-1)/(8 xx 10^15 s^-1)`
=`0.375 xx 10^-7 m = 3.75 nm ~~ 4 nm`.