Download App

Wave Optics — Physics STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 SciencePhysicsWave Optics1 Mark
Question

The slits in a Young's double slit experiment have equal widths and the source is placed symmetrically relative to the slits. The intensity at the central fringes is I0. If one of the slits is closed, the intensity at this point will be

(a) I0 

(b) I0 / 4

(c) I0 / 2

(d) 4I0
✓

Answer

(b) I0 / 4

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

Explore more

More "M.C.Q [1M]" from Wave Optics→Wave Optics — all question types→Physics STD 12 Science question papers→Bihar Board STD 12 Science question papers→Bihar Board question paper generator→

Similar questions

A neutron, a proton, an electron and an α−particle enter a region of uniform magnetic field with equal velocities. The magnetic field is perpendicular to the plane of paper and directed into it. The tracks of particles are labeled in the figure. The neutron follows the track:

→
Kirchhoff's second law in any closed circuit represents:
→
The shape of wave front at a very large distance from source is ______.
→
An electromagnetic wave is propagating along Y-axis. Then.
→
A solid sphere and a hollow sphere of the same material and of equal radii are heated to the same temperature:
  1. Both will emit equal amount of radiation per unit time in the biginning.
  2. Both will absorb equal amount of radiation from the surrounding in the biginning.
  3. The initial rate of cooling $\Big(\frac{\text{dT}}{\text{dt}}\Big)$ will be the same for the two spheres.
  4. The two spheres will have equal temperatures at any instant.
→

100 mA current gives a full scale deflection in a galvanometer of 2Ω  resistance. The resistance connected with the galvanometer to convert it into a voltmeter to measure 5V is

(a) 98 Ω  

(b) 52 Ω

(c) 50 Ω   

(d) 48 Ω
→

Out of gravitational, electromagnetic, Vander Waals, electrostatic and nuclear forces; which two are able to provide an attractive force between two neutrons

(a) Electrostatic and gravitational

(b) Electrostatic and nuclear

(c) Gravitational and nuclear

(d) Some other forces like Vander Waals
→
An electron moves with a constant velocity v in a uniform magnetic field B, parallel to the direction of the magnetic field. The force acting on electron is:
→
A very long bar magnet is placed with its north pole coinciding with the centre of a circular loop carrying as electric current i. The magnetic field due to the magnet at a point on the periphery of the wire is B. The radius of the loop is a. The force on the wire is:
  1. Very nearly $2\pi\text{aiB}$ perpendicular to the plane of the wire.
  2. $2\pi\text{aiB}$ in the plane of the wire.
  3. $\pi\text{aiB}$ along the magnet.
  4. Zero.
→

The current in a coil changes from 4 ampere to zero in 0.1 s. If the average e.m.f. induced is 100 volt, what is the self inductance of the coil

(a) 2.5 H

(b) 25 H

(c) 400 H

(d) 40 H

→