Time Left:
600
sec
1. For sustained interference we need two sources which emit waves:
A. with same amplitude
B. with same intensity
C. in a narrow beam
D. having constant phase difference
2. When the interference occurs with coherent sources, _______ of the superimposing waves add like _______.
A. intensities, scalars
B. amplitudes, vectors
C. amplitudes, scalars
D. intensities, vectors
3. Two sources of light are said to be coherent when both give out light waves of same:
A. phase and speed
B. wave length and constant phase difference
C. intensity and wavelength
D. amplitude and phase
4. Phase difference between two coherent sources should be:
A. zero
B. πn rad
C. π rad
D. π/2 rad
5. Coherent sources can be created by the division of:
A. only amplitude
B. only wave front
C. only wavelength
D. both amplitude and wave front
6. In a Fresnel's biprism experiment, the two coherent sources are obtained by:
A. two slits
B. reflection
C. Refraction
D. Internal reflection
9. Which of the following is not essential for two sources of light in Young's double slit experiment to produce a sustained interference?
A. equal frequency
B. Constant phase difference
C. equal intensity
D. equal wavelength
10. Which of the following is not an example of coherent source produced by the division of wavefront?
A. Fresnel's biprism
B. Lloyd's mirror
C. Young's double slit experiment
D. Interference by thin films
Submit Test