Atoms — Physics STD 12 Science — Question

What is shape of magnet in moving coil galvanometer to make the radial magnetic field

(a) Concave

(b) Horse shoe magnet

(c) Convex

(d) None of these

The electron emitted in beta radiation originates from:

Induced emf opposes :

In a p-n junction:

Planck constant has the same dimensions as:

1. Force × time.
2. Force × distance.
3. Force × speed.
4. Force × distance × time.

A constant current i is maintained in a solenoid. Which of the following quantities will increase if an iron rod is inserted in the soleniod along axis?

For intensity I of a light of wavelength 5000Å the photoelectron saturation current is 0.40 μA and stopping potential is 1.36 V, the work function of metal is

(a) 2.47 eV

(b) 1.36 eV

(c) 1.10 eV

(d) 0.43 eV

If two bodies A and B (A bigger in size than B) are rubbed together, then:

Light waves can be polarised as they are

(a) Transverse

(b) Of high frequency

(c) Longitudinal

(d) Reflected

The forbidden gap in the energy bands of germanium at room temperature is about

(a) 1.1 eV

(b) 0.1 eV

(c) 0.67 eV

(d) 6.7 eV