No verified paper has been uploaded for AJKPSC-PMS Paper Physics 2001 MCQs yet.
The MCQs below are drawn from the Physics subject category.
Showing 1411–1420
of 15721 MCQs
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1411
Two identical tuning forks vibrate at 256 c/sec. After loading one of them, 6 beats/sec are heard when forks are sounded together. The period of the loaded fork is:
Using Bragg's relation for first order: λ = 2d sinθ = 2×0.30 nm×sin30° = 0.30 nm.
1413
In Young's double slits experiment if the separation between the slits is reduced to half and the distance of the screen from the slits is doubled, then the fringe width is:
Moving the mirror by λ/4 changes the optical path by λ/2 (since path change = 2×mirror movement), producing a π phase shift that converts a bright fringe to the adjacent dark fringe.
1415
Two identical tuning forks emitting sound waves in the same direction, will produce:
Fringe spacing Δy = λL/d, so it varies inversely with slit separation d and directly with distance L.
1417
In a biprism experiment using sodium light of wavelength 6000 Å, 20 fringes occupy 2.0 cm. On replacing the sodium source by a source of wavelength λ' while making no other changes, 30 fringes are found to occupy 2.7 cm on the screen. The new wavelength λ' is
Blue light has a shorter wavelength than red, so diffraction fringes scale with wavelength and become closer (narrower and more crowded) for blue light.
1420
Of the two slits producing interference in Young's experiment, one is covered with glass so that light intensity passing is reduced to 50%. Which of the following is correct?
Unequal amplitudes from the slits reduce the maximum intensity and dark fringes are not perfectly zero, so bright fringe intensity decreases while dark fringe intensity increases.
