Question

Assertion : Interference pattern is made by using blue light instead of red light, the fringes becomes narrower.

Reason      :  In Young’s double slit experiment, fringe width is given by relation B =

(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.

(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.

(c) If assertion is true but reason is false.

(d) If the assertion and reason both are false.

Answer

(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

A proton, a neutron, an electron and an particle have same energy. Then their de Broglie wavelengths compare as:
What is not true of equipotential surface?

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

(a)  

(b)  

(c)  

(d)  

A circular coil of radius R carries an electric current. The magnetic field due to the coil at a point on the axis of the coil located at a distance r from the centre of the coil, such that r >> R, varies as

(a)   

(b)

(c)  

(d)

Magnetic flux during time interval $\tau$ varies through a stationary loop of resistance R, as $\phi_\text{B}=\text{at}(\tau-\text{t})$ Find the amount of heat generated during that time. Neglect the inductance of the loop.

A circular disc of which 2/3 part is coated with yellow and 1/3 part is with blue. It is rotated about its central axis with high velocity, then it will be seen as

(a) Green   

(b) Brown

(c) White                                           

(d) Violet

Which of the following properties of light conclusively support wave theory of light?

The self inductance of a straight conductor is     

(a) Zero

(b) Very large

(c) Infinity

(d) Very small

In an NPN transistor circuit, the collector current is 10 mA. If 90% of the electrons emitted reach the collector, the emitter current (iE) and base current (iB) are given by

(a) iE = – 1 mA, iB = 9 mA

(b) iE = 9 mA, iB = – 1 mA

(c) iE = 1 mA, iB = 11 mA

(d) iE = 11 mA, iB = 1 mA

At sun rise or sunset, the sun looks more red than at mid-day because

(a) The sun is hottest at these times

(b) Of the scattering of light

(c) Of the effects of refraction

(d) Of the effects of diffraction