MCQ
Two sources of monochromatic light in coherent, when their :
  • A
    intensities are equal
  • B
    amplitudes are equal
  • phases are equal
  • D
    none of these

Answer

Correct option: C.
phases are equal
C

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

When NPN transistor is used as an amplifier(a) Electrons move from base to collector (b) Holes move from emitter to base(c) Electrons move from collector to base(d) Holes move from base to emitter
 
 
 
 
The inductance of a resistanceless coil is 0.5 henry. In the coil, the value of alternating current is 0.2 A, whose frequency is 50 Hz. The reactance of circuit is.
The number of turns in an air core solenoid of length $25\ cm$ and radius $4\ cm$ is $100.$ Its self inductance will be.
The diffraction effect can be observed in(a) Only sound waves(b) Only light waves(c) Only ultrasonic waves (d) Sound as well as light waves
   
   
The dimensions of magnetic flux are
Rydberg’s constant is:
A semiconductor is a material with a small but non-zero band gap that behaves as an insulator at absolute zero but allows thermal excitation of electrons into its ____________ at temperatures that are below its melting point.
In Balmer series of emission spectrum of hydrogen, first four lines with different wavelength $\text{H}\alpha $ $ \text{H}\beta$ $\text{H}\gamma$ and $\text{H}\delta$ are obtained. Which line has maximum frequency out of these?
A 20cm long capillary tube is dipped in water. The water rises up to 8cm. If the entire arrangement is put in a freely falling elevator, the length of water column in the capillary tube will be:
  1. 8cm
  2. 6cm
  3. 10cm
  4. 20cm
Two ideal slits $S_1$ and $S_2$ are at a distance $d$ apart, and illuminated by light of wavelength $\lambda$ passing through an ideal source slit $S$ placed on the line through $S_2$ as shown. The distance between the planes of slits and the source slit is $D$. A screen is held at a distance $D$ from the plane of the slits. The minimum value of $d$ for which there is darkness at $O$ is