An electron and a photon, each has a wavelength of `1.2A`. What is the ratio of their energies?

Options

A. 0.048611111111111
B. `1:10^(2)`
C. `1:10^(3)`
D. `1:10^(4)`

Answer

B

Explanation

`(E_e)/(E_(ph))=((h^2)/(2mlada^2))/((hc)/(lamda))=(h^2)/(2mlamda^2)xx(lamda)/(hc)xx(h)/(2lamdac)`
`=(6.6xx10^(-34))/(2xx9.1xx10^(-31)xx1.2xx10^(-10)xx3xx10^(8))`
`(1)/(100)`