Semiconductor Electronic: Material, Devices And Simple Circuits — Physics STD 12 Science — Question

What is the effect on Fresnel’s biprism experiment when the use of white light is made

(a) Fringe are affected

(b) Diffraction pattern is spread more

(c) Central fringe is white and all are coloured

(d) None of these

When stopping potential is applied in an experiment on photoelectric effect, no photocurrent is observed. This means that:

Field lines are shown close together where the

When a glass rod is rubbed with silk, it

(a) Gains electrons from silk	(b) Gives electrons to silk
(c) Gains protons from silk	(d) Gives protons to silk

Consider the diffraction patern for a small pinhole. As the size of the hole is increased:

When _15​P³⁰ decays to become _14​Si³⁰, which particle is released?

Nuclear forces exists between:

Two point sources X and Y emit waves of same frequency and speed but Y lags in phase behind X by 2pl radian. If there is a maximum in direction D the distance XO using n as an integer is given by

(a)

(b)

(c)

(d)

The equivalent resistance of the following diagram A and B is

(a)

(b) 9 W

(c) 6 W

(d) None of these

A certain wire has a resistance R. The resistance of another wire identical with the first except having twice its diameter is

(a)  2R

(b) 0.25 R

(c) 4R

(d) 0.5 R