Dual Nature of Radiation and Matter — Physics STD 12 Science — Question

Figure shows three points A, B and C in a region of uniform electric field .  The line AB is perpendicular and BC is parallel to the field lines. Then which of the following holds good. Where  and  represent the electric potential at points  A, B and C respectively

(a)

(b)

(c)

(d)

The dimension of (1/2)  : permittivity of free space; E : electric field) is

(a)

(b)

(c)

(d)

The wavelength   of the   line of characteristic X-ray spectra varies with atomic number approximately

(a)

(b)

(c)

(d)

Which of the following formula is correct for a spherical lens?

Mutual inductance of two coils is M. If current change in time t in first coil is I, then induced emf in the second coil is:

Temperature above which a ferromagnetic substance becomes paramagnetic is called

(a) Critical temperature	(b) Boyle's temperature
(c) Debye's temperature	(d)  Curie temperature

The figure represents the observed intensity of X-rays emitted by an X-ray tube as a function of wavelength. The sharp peaks A and B denote

(a) Band spectrum	(b) Continuous spectrum
(c) Characteristic radiations	(d) White radiations

The net resistance of an ammeter should be small to ensure that:

In an elastic collision:

1. The kinetic energy remains constant.
2. The linear momentum remains constant.
3. The final kinetic energy is equal to the initial kinetic energy.
4. The final linear momentum is equal to the initial linear momentum.