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MDCAT Physics Chapter 12 Atomic spectra MCQ's Test
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Total Questions20
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Time Allowed20
MDCAT Physics Chapter 12 Atomic spectra MCQ's Test
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Question # 1
When an electron in an atom goes from a lower to higher its:
Question # 2
The de-Broglie wavelength of the particle of mass m and energy E is:
Question # 3
A proton, accelerated through a p.d V has a certain de Broglie wavelength. In order to have the same de Broglie wavelength, an 𝑎 −particles must be accelerated through a potential difference:
Question # 4
A photo cell receives light from a source at 50 cm away and produces 40mAcurrent inthe circuit. When the same source at is at distance 1 m from photo cell,current in the circuit will be
Question # 5
The potential difference applied to an X-rays tube is increased. As a result, in the emitted radiation
Question # 6
Monochromatic light of wavelength 300 nm is incident normally on a surface of area 4 cm2.If the intensity of light is 150 mW/m2; the rate at which photon strike the surface:
Question # 7
de-Broglie wavelength associated with an electron moving at a speed of 1x106 ms-1 is
Question # 8
In electron microscope, we use high speed electrons because them
Question # 9
The Balmer series is found in the spectrum of:
Question # 10
To find longest wavelength radiation in Ballmer series, the value of n used is:
Question # 11
As the intensity of incident light increases:
Question # 12
Temperature of black body radiating at 270c is increased to 327oc, then emittedenergywill increase by
Question # 13
Intensity of light from a point source at the edge of unit sphere will be:
Question # 14
In photo electric cell, the photo electric current
Question # 15
Light of frequency 1.5 times the threshold frequency is incident on a photo sensitive material. If the frequency is halved and intensity is doubled the photo electric current becomes
Question # 16
The shortest wavelength of X-rays emitted from an X-rays tube depends on the:
Question # 17
Light elements do not emit X-rays because
Question # 18
Which of the following statement is true about soft X-rays?
Question # 19
Of electron of 50 keV strike a heavy target. Then radiation emitted by target will be
Question # 20
An electron and a proton are accelerated through the same potential. If their masses are me and mp respectively, then the ratio of their de-Broglie wavelength is:
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