The distance between a light source and photoelectric cell is d. If the distance is decreased to `(d)/(2)` then

A source of light is placed at a distance of 50 cm from a photo cell and the stopping Potential is found to be V_0 . If the distance between the light surface and photo cell is made 25 cm, the new stopping potential will be

Two ideal slits S_(1) and S_(2) are at a distance d apart, and illuninated by light of wavelength lambda passing through an ideal source slit S placed on the line through S_(2) as shown. The distance between the planes of slits and the source slit is D.A screen is held at a distance D from the plane of the slits. The minimum value of d for which there is darkness at O is (dlt lt D)

Two ideal slits S_(1) and S_(2) are at a distance d apart, and illuninated by light of wavelength lambda passing through an ideal source slit S placed on the line through S_(2) as shown. The distance between the planes of slits and the source slit is D.A screen is held at a distance D from the plane of the slits. The minimum value of d for which there is darkness at O is (dlt lt D)

Intensity of radiation received by an absorber is 100 units when the distance between source & absorber is 'd' units. If the distance is doubled then intensity received will be

In Young's double experiment , in air interference pattern second minimum is observed exactly in front of one slit. The distance beween the two coherent source is 'd' and the distance between source and screen 'D'. The wavelength of light source used is

In Young's double experiment , in air interference pattern second minimum is observed exactly in front of one slit. The distance beween the two coherent source is 'd' and the distance between source and screen 'D'. The wavelength of light source used is

The photo electric current at distances r_1 and r_2 of light source from photoelectric cell are I_1 and I_2 respectively. Find the value of I_1//I_2 .

If the distance between a point source and screen is doubled, then intensity of light on the screen will become