A wave in a string has an amplitude of 2cm. The wave travels in the positive direction of x- axis with a speed of 128 m/s and it is noted that 5 complete waves fit […]
The wave described by y = 0.25 sin (10 2πx – 2πt), where x and y are in meters and t in second is a wave travelling along the:
Options
(a) negative x […]
A thin film of soap solution (n=1.4) lies on the top of a glass plate (n=1.5). When visible light is incident almost normal to the plate, two adjacent reflection maxima are observed at two wavelengths […]
In Young’s experiment, the third bright band for light of wavelength 6000Å coincides with the fourth bright band for another source of light in the same arrangement. Then the wavelength of second source is
An unpolarised beam of intensity I₀ falls on a polaroid. The intensity of the emergent light is
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(a) I₀/4 (b) zero (c) I₀/2 (d) I₀
Correct Answer:
I₀/2
Explanation:
When unpolarised beam […]
In Young’s double slit experiment, a third slit is made in between the double slits. Then
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(a) fringes of unequal width are formed (b) contrast between bright and dark fringes is reduced […]
If the ratio of amplitude of two superposed waves is 2:1, then the ratio of maximum intensity and minimum intensity is
Options
(a) (9:1) (b) (1:9) (c) (4:1) (d) (1:4)
Correct Answer:
(9:1)
Explanation: […]
If seperation between screen and source is increased by 2%. What would be the effect on the intensity?
Options
(a) increases by 4% (b) increases by 2% (c) decreases by 2% (d) decreases […]
A single slit Fraunhogger diffraction pattern is formed with white light. For what wavelength of light the third secondary maximum in the diffraction pattern coincides with the second secondary maximum in the pattern for red […]
In Young’s double slit experiment with sodium vapour lamp of wavelength 589 nm and the slits 0.589 mm apart, the half angular width of the central maximum is
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(a) sin⁻¹ 0.01 (b) sin⁻¹ […]
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