Wave Optics-III Physics Test Series IIT JEE

Test Preparation on Wave Optics-III-Physics Test Series IIT JEE-2020

1.

An observer is moving with half the speed of light towards
stationary microwave source emitting waves at frequency 10
GHz. What is the frequency of the microwave measured by
the observer ? (speed of light = 3x108ms-1 )

115.3 GHz
210.1 GHz
312.1 GHz
417.3 GHz

2.

11
22
33
44

3.

A parallel beam of fast moving electrons is incident normally
on a narrow slit. A screen is placed at a large distance from
the slit. If the speed of the electrons is increased, which of
the following statement is correct-

1Diffraction pattern is not observed on the screen in the case of electrons
2The angular width of the central maxima of the diffraction pattern will increase
3The angular width of the central maxima will decrease
4The angular width of the central maxima will remain the same

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