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Explain diffraction of Sound Waves and Its Importance in Daily Life.

Important Questions on Superposition of Waves

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Physics>Waves>Superposition of Waves>Diffraction of Waves
Write essential conditions for obtaining pure spectrum.
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Physics>Waves>Superposition of Waves>Diffraction of Waves
The box of a pin hole camera, of length L, has a hole of radius a. It is assumed that when the hole is illuminated by a parallel beam of light of wavelength λ the spread of the spot (obtained on the opposite wall of the camera) is the sum of its geometrical spread and the spread due to diffraction. The spot would then have its minimum size (say bmin ) when:
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Physics>Waves>Superposition of Waves>Diffraction of Waves
When one can notice the phenomenon of diffraction of light?
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Physics>Waves>Superposition of Waves>Diffraction of Waves
A single slit diffraction experiment uses a slit of width of 5.5μm. The number of dark fringes produced on each side of the central bright fringe when light of wavelength 660nm is used to illuminate the screen is
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Physics>Waves>Superposition of Waves>Diffraction of Waves
Light travels in a straight line because
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Physics>Waves>Superposition of Waves>Diffraction of Waves

What is diffraction of light?

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Physics>Waves>Superposition of Waves>Diffraction of Waves

Write definitions:

Diffraction of light.

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Physics>Waves>Superposition of Waves>Diffraction of Waves
A parallel beam of electrons travelling in x - direction falls on a slit of width d (see figure). If after passing the slit, an electron acquires momentum py in the y - direction then for a majority of electrons passing through the slit (h is Planck's constant):

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Physics>Waves>Superposition of Waves>Diffraction of Waves
The luminous border that surrounds the profile of a mountain just before sun rises behind it, is an example of
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Physics>Waves>Superposition of Waves>Diffraction of Waves
The penetration of light into the region of geometrical shadow is called
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Physics>Waves>Superposition of Waves>Diffraction of Waves
When a Compact Disc CD is illuminated by small source of white light coloured bands observed. This due to
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Physics>Waves>Superposition of Waves>Diffraction of Waves
The wave nature of electrons was experimentally verified by,
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Physics>Waves>Superposition of Waves>Diffraction of Waves
In a diffraction pattern due to a single slit of width a the first minimum is observed at an angle 30o when light of wavelength 5000 Å is incident on the slit. The first secondary maximum is observed at an angle of:
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Physics>Waves>Superposition of Waves>Diffraction of Waves
Does the principle of conservation of energy hold for interference and diffraction phenomena? Explain briefly.
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Physics>Waves>Superposition of Waves>Diffraction of Waves
At the first minimum adjacent to the central maximum of a single-slit diffraction pattern, the phase difference between the Huygen's wavelet from the edge of the slit and the wavelet from the midpoint of the slit is:
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Physics>Waves>Superposition of Waves>Diffraction of Waves
A beam of light of λ=600 nm from a distant source falls on a single slit 1 mm wide and the resulting diffraction pattern is observed on a screen 2 m away. The distance between first dark fringes on either side of the central bright fringe is:
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Physics>Waves>Superposition of Waves>Diffraction of Waves
A single slit of width 0.1 mm is illuminated by a parallel beam of light of wavelength 6000 Å and diffraction bands are observed on a screen 0.5 m from the slit. The distance of the third dark band from the central bright band is:
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Physics>Waves>Superposition of Waves>Diffraction of Waves

The position of the direct image obtained at O, when a monochromatic beam of light is passed through a plane transmission grating at normal incidence is shown in figure. The diffracted images A, B and C correspond to the first, second and third order diffraction. When the source is replaced by another source of shorter wavelength

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Physics>Waves>Superposition of Waves>Diffraction of Waves
Obtain an expression for width of central maxima by diffraction of light at a single slit.
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Physics>Waves>Superposition of Waves>Diffraction of Waves

In the figure below, P and Q are two equally intense coherent sources emitting radiation of wavelength 20m. The separation between P and Q is 5m and the phase of P is ahead of that of Q by 90°.A,B and C are three distinct point of observation, each equidistant from the midpoint of PQ. The intensities of radiation at A,B,C will be in the ratio :

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