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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

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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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