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

Three right angled prisms of refractive indices  and  are fixed together using an optical glue as shown in figure. If a ray passes through the prisms without suffering any deviation, then

(a)	(b)
(c)	(d) 1 +

Two satellites A and B move round the earth in the same orbit. The mass of B is twice the mass of A:

1. Speeds of A and B are equal.
2. The potential energy of earth +A is same as that of earth +B.
3. The kinetic energy of A and B are equal.
4. The total energy of earth +A is same as that of earth +B.

A photon will have less energy, if its:

A beam of light is converging towards a point I on a screen. A plane glass plate whose thickness in the direction of the beam = t, refractive index = μ, is introduced in the path of the beam. The convergence point is shifted by

(a) away

(b)  away

(c)  nearer

(d)  nearer

An ammeter whose resistance is 180 Ω gives full scale deflection when current is 2 mA. The shunt required to convert it into an ammeter reading 20 mA (in ohms) is

(a) 18

(b) 20

(c) 0.1

(d) 10

In extrinsic P and N-type, semiconductor materials, the ratio of the impurity atoms to the pure semiconductor atoms is about

(a) 1

(b)

(c)

(d)

Which of the following property of an element never changes?

The kinetic energy of an electron with de-Broglie wavelength of 0.3 nanometer is

(a) 0.168 eV

(b) 16.8 eV

(c) 1.68 eV

(d) 2.5 eV

Light of wavelength  strikes a photo-sensitive surface and electrons are ejected with kinetic energy E. If  the kinetic energy is to be increased to 2E, the wavelength must be changed to   where

(a)

(b)

(c)  <

(d)