## In deriving the single slit diffraction pattern, it was stated that the intensity is zero at angles nλ / a . Justify this by suitably dividing the slit to bring out the cancellation.

In deriving the single slit diffraction pattern, it was stated that the intensity is zero at angles nλ / a . Justify this by suitably dividing the slit to bring out the cancellation.

## Answer the following questions: (a) When a low flying aircraft passes overhead, we sometimes notice a slight shaking of the picture on our TV screen. Suggest a possible explanation.

Answer the following questions: (a) When a low flying aircraft passes overhead, we sometimes notice a slight shaking of the picture on our TV screen. Suggest a possible explanation. (b) As you have learnt in the text, the principle of linear Read More …

## A parallel beam of light of wavelength 500 nm falls on a narrow slit and the resulting diffraction pattern is observed on a screen 1 m away. It is observed that the first minimum is at a distance of 2.5 mm from the centre of the screen. Find the width of the sit.

A parallel beam of light of wavelength 500 nm falls on a narrow slit and the resulting diffraction pattern is observed on a screen 1 m away. It is observed that the first minimum is at a distance of 2.5 mm from Read More …

## Two towers on top of two hills are 40 km apart. The line joining them passes 50 m above a hill halfway between the towers. what is the longest wavelength of radio waves, which can be sent between the towers Without appreciable diffraction effects?

Two towers on top of two hills are 40 km apart. The line joining them passes 50 m above a hill halfway between the towers. what is the longest wavelength of radio waves, which can be sent between the towers Without appreciable Read More …

## Answer the following questions: (a) In a single slit diffraction experiment, the width of the slit is made double the original width. how does this affect the size and intensity of the central diffraction band?

Answer the following questions: (a) In a single slit diffraction experiment, the width of the slit is made double the original width. how does this affect the size and intensity of the central diffraction band? (b) In what way is diffraction Read More …

## In double-slit experiment using light of wavelength 600 nm, the angular width of a fringe formed on a distant screen is 0.1° . What is the spacing between the two slits?

In double-slit experiment using light of wavelength 600 nm, the angular width of a fringe formed on a distant screen is 0.1° . What is the spacing between the two slits?

## For sound waves, the Doppler formula for frequency shift differs slightly between the two situations: (i) source at rest; observer moving, and source moving; observer at rest. The exact Doppler formulas for the case of light waves in vacuum are, however, strictly identical for these situations. Explain why this should be so. Would you expect the formulas to be strictly identical for the two situations in case of light travelling in a medium?

For sound waves, the Doppler formula for frequency shift differs slightly between the two situations: (i) source at rest; observer moving, and source moving; observer at rest. The exact Doppler formulas for the case of light waves in vacuum are, however, strictly Read More …

## Let us list some of the factors, which could possibly influence the speed of wave propagation: (i) Nature of the source.

Let us list some of the factors, which could possibly influence the speed of wave propagation: (i) Nature of the source. (ii) Direction of propagation. (iii) Motion of the source and/or observer. (iv) Wave length. (v) Intensity of the wave. Read More …

## You have learnt in the text how Huygens’ principle leads to the laws of reflection and refraction. use the same principle to deduce directly that a point object placed in front of a plane mirror produces a virtual image whose distance from the mirror is equal to the object distance from the mirror.

You have learnt in the text how Huygens’ principle leads to the laws of reflection and refraction. use the same principle to deduce directly that a point object placed in front of a plane mirror produces a virtual image whose distance from Read More …

## Explain how Corpuscular theory predicts the speed of light in a medium, say Water to be greater than the speed of light in vacuum. Is the prediction confirmed by experimental determination of the speed of light in water? If not, which alternative picture of light is consistent with experiment?

Explain how Corpuscular theory predicts the speed of light in a medium, say Water to be greater than the speed of light in vacuum. Is the prediction confirmed by experimental determination of the speed of light in water? If not, which alternative Read More …

## The 6563 Å  Ha line emitted by hydrogen in a star is found to be red shifted by  15 Å . Estimatethe speed with which the star is receding from the Earth.

The 6563 Å  Ha line emitted by hydrogen in a star is found to be red shifted by  15 Å . Estimatethe speed with which the star is receding from the Earth.

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