The speed of a photon is one hundredth of the speed light in vacuum. What is the de Broglie wavalengths. Assume that one mole of protons has a mass equal to one gram. `h = 6.626 xx 10^-27 erg sec`.

Options

A. `3.31 xx 10^-3 Å`
B. `1.33 xx 10^-3 Å`
C. `3.13 xx 10^-2 Å`
D. `1.31 xx 10^-2 Å`

Answer

B

Explanation

(b) `m = (1)/(6.023 xx 10^23) g`
`lamda = (h)/(mv)`
=`(6.626 xx 10^-27)/(1 xx 3 xx 10^8 cm sec^-1) xx 6.023 xx 10^23`
=`1.33 xx 10^-11 cm`.