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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

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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?

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