Tiwari Academy Discussion

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

Ashok0210

Asked: March 21, 2021In: Class 12 Physics

Estimate the distance for which ray optics is good approximation for an aperture of 4 mm and wavelength 400 nm.

Class 12 Physics CBSE and UP Board Wave Optics Chapter-10 Exercise 10.10 NCERT Solutions for Class 12 Physics Chapter 10 Question-10

Ashok0210

Asked: March 21, 2021In: Class 12 Physics

Light of wavelength 5000 Aº falls on a plane reflecting surface. What are the wavelength and frequency of the reflected light? For what angle of incidence is the reflected ray normal to the incident ray?

Class 12 Physics CBSE and UP Board Wave Optics Chapter-10 Exercise 10.9 NCERT Solutions for Class 12 Physics Chapter 10 Question-9

Ashok0210

Asked: March 5, 2021In: Class 12 Physics

Do the same exercise as above with the replacement of the earlier transformer by a 40,000-220 V step-down transformer (Neglect, as before, leakage losses though this may not be a good assumption any longer because of the very high voltage transmission involved). Hence, explain why high voltage transmission is preferred?

Class 12 Physics CBSE and UP Board Alternating Current Chapter-7 Exercise 7.26 Additional Exercise NCERT Solutions for Class 12 Physics Chapter 7 Question 26

Ashok0210

Asked: March 5, 2021In: Class 12 Physics

Obtain the resonant frequency and Q-factor of a series LCR circuit with L = 3.0 H, C = 27 μF, and R = 7.4 Ωμ. It is desired to improve the sharpness of the resonance of the circuit by reducing its ‘fiill width at half maximum’ by a factor of 2. Suggest a suitable way.

Class 12 Physics CBSE and UP Board Alternating Current Chapter-7 Exercise 7.21 Additional Exercise NCERT Solutions for Class 12 Physics Chapter 7 Question 21

Ashok0210

Asked: March 5, 2021In: Class 12 Physics

A power transmission line feeds input power at 2300 V to a stepdown transformer with its primary windings having 4000 turns. What should be the number of turns in the secondary in order to get output power at 230 V?

Class 12 Physics CBSE and UP Board Alternating Current Chapter-7 Exercise 7.23 Additional Exercise NCERT Solutions for Class 12 Physics Chapter 7 Question 23

Ashok0210

Asked: March 5, 2021In: Class 12 Physics

At a hydroelectric power plant, the water pressure head is at a height of 300 m and the water flow available is 100 m³ s⁻¹. If the turbine generator efficiency is 60%, estimate the electric power available from the plant (g = 9.8 ms⁻²).

Class 12 Physics CBSE and UP Board Alternating Current Chapter-7 Exercise 7.24 Additional Exercise NCERT Solutions for Class 12 Physics Chapter 7 Question 24

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.

Estimate the distance for which ray optics is good approximation for an aperture of 4 mm and wavelength 400 nm.

Light of wavelength 5000 Aº falls on a plane reflecting surface. What are the wavelength and frequency of the reflected light? For what angle of incidence is the reflected ray normal to the incident ray?

Obtain the resonant frequency and Q-factor of a series LCR circuit with L = 3.0 H, C = 27 μF, and R = 7.4 Ωμ. It is desired to improve the sharpness of the resonance of the circuit by reducing its ‘fiill width at half maximum’ by a factor of 2. Suggest a suitable way.

A power transmission line feeds input power at 2300 V to a stepdown transformer with its primary windings having 4000 turns. What should be the number of turns in the secondary in order to get output power at 230 V?

At a hydroelectric power plant, the water pressure head is at a height of 300 m and the water flow available is 100 m³ s⁻¹. If the turbine generator efficiency is 60%, estimate the electric power available from the plant (g = 9.8 ms⁻²).

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