Question

Please answer Q2 (A and B) Will Rate Thank you!

A) Calculate index of refraction (n) of a medium where light can pass through at a speed of 1.5 x10^8 m/s?

B) What is the cut off wavelength (λc) for a photoelectric materials of work function 1.1 eV?

Answer 1

Refractive index

$n=\frac{C}{v}$    where C is velocity of light in vacuum and v is the velocity of light at medium

$n=\frac{3*10^{8}}{1.5*10^{8}}=2$

Refractive index =2

b)

Work function

$W=\frac{hC}{\lambda _{0}}$      where h is planks consant, C is velocity of light in vacuum, ${\lambda _{0}}$ is cut of wavelength

do hC W 6.626 * 10 *3*108 1.1 * 1.602 * 10-19 = 1.127 * 10-m = 1127nm