How does the stopping potential applied to a photocell change if the distance between the light source and the cathode of the cell is doubled?

How does the force of gravitation between two objects change when the distance between them is reduced to half ?

Does the change in frequency due to Doppler's effects depends on the distance between the source and the listner?

The figure shows the stopping potential for the phototelectron versus (1/lambda) graph for two metals A and B, lambda being the wavelength of incident light If the distance between the light source and the surface of metal A is increased, how will the stopping potentail for the electrons emitted from it be affected? justify your answer.

How does the resolving power of a compound microscope change of decreasing the wave length of light used,and

How does plant cell change its shape?

In Young's double slit experiment,usin light of wavelength 400 nm,interference fringes of width X are obtained .The wavelength of light is increassed to 600 nm and the separation between the slits is halved.If one wants the observed fringe width on the screen to be the same in the two caes,find the rati of the distance between the screen and the plane of the interfering sources in the two arrangements.

How would the angular separation of interfernece frings in Young's double slit experiment change when the distance of separation between the slits and the screen is doubled?