Question

A student using a diffraction grating ruled with 6.20 x 104 lines/m to measure the frequency of some monochromatic light. If the nodal lines are 0.0522 m apart at a distance of 1.50 m from the grating, what is the frequency of the light used? (5.3 x 1014 Hz)

Answer 1

N = 6.2x10t lines/m B = 0.052am D = 1.5m Slit width d= 4 From diffraction theory, I wavelength G speed of tight Light 5 7 Хеадеng

B - CDN = (3.410° ) (1,516.2x104) f = 5.344 x 1014 Hz. 0.0522 From (i) som ß = CON New frequency = B = CDN SDN SUDAN

13! = 5(3x103)(1,5)(6.2x104) 4 x 5.34 x 1014 B = 0.0653m