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

Three charges - and  are placed as shown in the figure. The x-component of the force on - is proportional to

(a)

(b)

(c)

(d)

In Rutherford scattering experiment, what will be the correct angle for α scattering for an impact parameter b = 0

(a) 90°

(b) 270°

(c) 0°

(d) 180°

A nucleus of   originally at rest emits a particle with speed v. What will be the recoil speed of the daughter nucleus

(a) 4v/206

(b) 4v/214

(c) v/206

(d) v/214

The self induction takes place when magnetic flux through a coil:

On the bombardment of neutron with Boron. a-particle is emitted and product nuclei formed is

(a)

(b)

(c)

(d)

A sensitive magnetic instrument can be shielded very effectively from outside magnetic fields by placing it inside a box of

(a) Teak wood	(b) Plastic material
(c) Soft iron of high permeability	(d) A metal of high conductivity

A metallic rod of mass per unit length 0.5kg m^–1 is lying horizontally on a smooth inclined plane which makes an angle of 30°with the horizontal. The rod is not allowed to slide down by flowing a current through it when a magnetic field of induction 0.25 T is acting on it in the vertical direction. The current flowing in the rod to keep it stationary is:

The materials which allow to pass electricity through them easily are called as:

Light waves can be polarised as they are

(a) Transverse

(b) Of high frequency

(c) Longitudinal

(d) Reflected

In a metal, the separation between conduction band and valence band is of the order: