Atoms — Physics STD 12 Science — Question

Anti-nodal curves represent the points joining:

White light is incident on the interface of glass and air as shown in the figure. If green light is just totally internally reflected then the emerging ray in air contains

(a) Yellow, orange, red	(b) Violet, indigo, blue
(c) All colours	(d) All colours except green

The magnetic moment (μ) of a revolving electron around the nucleus varies with principal quantum number n as

(a) μ ∝ n

(b) μ ∝ 1/n

(c) μ ∝

(d) μ ∝ 1/

In the following diagram if V₂ > V₁ then

(a)

(b)

(c)

(d)

The distance of two points on the axis of a magnet from its centre is 10 cm and 20 cm respectively. The ratio of magnetic intensity at these points is 12.5 : 1. The length of the magnet will be

(a) 5 cm

(b) 25 cm

(c) 10 cm

(d) 20 cm

Identify the paramagnetic substance

(a) Iron

(b) Aluminium

(c) Nickel

(d) Hydrogen

A 2 MeV proton is moving perpendicular to a uniform magnetic field of 2.5 tesla. The force on the proton is

(a) 2.5

(b) 7.6

(c) 2.5

(d) 7.6

Energy of photon whose frequency is ,  will be

(a) 4.14

(b) 4.14

(c) 4.14

(d) 4.14

When air is replaced by a dielectric medium of constant k, the maximum force of attraction between two charges separated by a distance

(a) Decreases k  times	(b) Remains unchanged
(c) Increases k times	(d) Increases  times

Which of the following electromagnetic waves has the longest wavelength ?