Electromagnetic Waves — Physics STD 12 Science — Question

In Young's double-slit experiments, a monochromatic light source is used. The shape of interference fringes produced on screen will be :

The law, governing the force between electric charges is known as.

In the position of minimum deviation when a ray of yellow light passes through the prism, then its angle of incidence is

(a) Less than the emergent angle

(b) Greater than the emergent angle

(c) Sum of angle of incidence and emergent angle is 90°

(d) Equal to the emergent angle

When a photon stimulates the emission of another photon, the two photons have:

1. Same energy.
2. Same direction.
3. Same phase.
4. Same wavelength.
5. All of the above

A total charge Q is broken in two parts  and  and they are placed at a distance R from each other. The maximum force of repulsion between them will occur, when

(a)	(b)
(c)	(d)

A square metallic wire loop of side 0.1 m and resistance of 1W is moved with a constant velocity in a magnetic field of 2 wb/m² as shown in figure. The magnetic field is perpendicular to the plane of the loop, loop is connected to a network of resistances. What should be the velocity of loop so as to have a steady current of 1mA in loop

(a) 1 cm/sec

(b) 2 cm/sec

(c) 3 cm/sec

(d) 4 cm/sec

In a meter bridge, the balancing length from the left end (standard resistance of one ohm is in the right gap) is found to be 20 cm. The value of the unknown resistance is

(a) 0.8 Ω

(b) 0.5 Ω

(c) 0.4 Ω

(d) 0.25 Ω

The first spectral series was disscovered by:

In the spectrum of hydrogen atom, the ratio of the longest wavelength in Lyman series to the longest wavelength in the Balmer series is

(a) 5/27

(b) 1/93

(c) 4/9

(d) 3/2

The speed of light depends: