The diffracted X rays from `CuSO_(4)` crystal are allowed to fall on a photographic plate. What happens to the photographic plate. 

What happens when photographic plate is developed with hypo?

Discuss the effect of alpha-, beta- and gamma -rays on a photographic plate.

(i) Explain how anode rays are produced in a discharge tube? (ii) Why is the effect of beta -particles on a photographic plate more than that of alpha - particles?

What happens when the radiations obtained from a radio active substance are passed through an electric field, marks are found at three places on the photographic plate placed in its path. Give reason.?

Photographic plates and films have an essential ingredient of

Photographic films or plates have …… as an essential ingredient.

What force must be applied to detach two wetted photographic plates (9 cm xx 12 cm) in size from each other without shifting them. The thickness of water between the plates is 0.05 mm. Surface tension of water is 0.073 N/m.

The first - order diffraction os X- rays from a certain set of crystal planes occurs an angle of 11.8^(@) from the planes. If the planes are 0.281 nm apart, what is the wavelength of X- rays?

The charged plates of a capacitor attract each other. So work by some external force is required to pull the plates farther apart. What happens to the energy added by this work.