Aagar

Ashok0210

Asked: March 21, 2021In: Class 12 Physics

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 superposition of wave displacement is basic to understanding intensity distributions in diffraction and interference patterns. What is the justification of this principle?

Class 12 Physics CBSE and UP Board Wave Optics Chapter-10 Exercise 10.20 NCERT Solutions for Class 12 Physics Chapter 10 Question-20 Additional Exercise

Ashok0210

Asked: March 21, 2021In: Class 12 Physics

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 slit.

Class 12 Physics CBSE and UP Board Wave Optics Chapter-10 Exercise 10.19 NCERT Solutions for Class 12 Physics Chapter 10 Question-19 Additional Exercise

Ashok0210

Asked: March 21, 2021In: Class 12 Physics

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?

Class 12 Physics CBSE and UP Board Wave Optics Chapter-10 Exercise 10.18 NCERT Solutions for Class 12 Physics Chapter 10 Question-18 Additional Exercise

Ashok0210

Asked: March 21, 2021In: Class 12 Physics

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 from each slit related to the interference pattern in a double-slit experiment? (c) When a tiny circular obstacle is placed in the path of light from a distant source, a bright spot is seen at the centre of the shadow of the obstacle. Explain why? (d) Two students are separated by a 7 m partition wall in a room 10 m high. If both light and sound waves can bend around obstacles, how is it that the students are unable to see each other even though they can converse easily. (e) Ray optics is based on the assumption that light travels in a straight line. Diffraction effects (observed when light propagates through small apertures/slits or around small obstacles) disprove this assumption. Yet the ray optics assumption is so commonly used in understanding location and several other properties of images in optical instruments. What is the justification?

Class 12 Physics CBSE and UP Board Wave Optics Chapter-10 Exercise 10.17 NCERT Solutions for Class 12 Physics Chapter 10 Question-17 Additional Exercise

Ashok0210

Asked: March 21, 2021In: Class 12 Physics

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

Class 12 Physics CBSE and UP Board Wave Optics Chapter-10 Exercise 10.16 NCERT Solutions for Class 12 Physics Chapter 10 Question-16 Additional Exercise

Ashok0210

Asked: March 21, 2021In: Class 12 Physics

For sound waves, the Doppler formula for frequency shift differs slightly between the two situations: (i) source at rest; observer moving, and (ii) 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?

Class 12 Physics CBSE and UP Board Wave Optics Chapter-10 Exercise 10.15 NCERT Solutions for Class 12 Physics Chapter 10 Question-15 Additional Exercise

Ashok0210

Asked: March 21, 2021In: Class 12 Physics

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. On which of these factors, if any, does (a) The speed of light in vacuum, (b) The speed of light in a medium (say, glass or water), depend?

Class 12 Physics CBSE and UP Board Wave Optics Chapter-10 Exercise 10.14 NCERT Solutions for Class 12 Physics Chapter 10 Question-14 Additional Exercise

Ashok0210

Asked: March 21, 2021In: Class 12 Physics

You have learnt in the text how Huygens’s 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.

Class 12 Physics CBSE and UP Board Wave Optics Chapter-10 Exercise 10.13 NCERT Solutions for Class 12 Physics Chapter 10 Question-13 Additional Exercise

Ashok0210

Asked: March 21, 2021In: Class 12 Physics

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?

Class 12 Physics CBSE and UP Board Wave Optics Chapter-10 Exercise 10.12 NCERT Solutions for Class 12 Physics Chapter 10 Question-12 Additional Exercise

Ashok0210

Asked: March 21, 2021In: Class 12 Physics

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

Class 12 Physics CBSE and UP Board Wave Optics Chapter-10 Exercise 10.11 NCERT Solutions for Class 12 Physics Chapter 10 Question-11 Additional Exercise

Aagar

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 slit.

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?

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

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?

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

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