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Ashok0210

Asked: March 21, 2021In: Class 12 Physics

A radio can tune in to any station in the 7.5 MHz to 12 MHz band. What is the corresponding wavelength band?

Class 12 Physics CBSE and UP Board Electromagnetic Waves Chapter-8 Exercise 8.5 NCERT Solutions for Class 12 Physics Chapter 8 Question 5

Ashok0210

Asked: March 21, 2021In: Class 12 Physics

A plane electromagnetic wave travels in vacuum along z-direction. What can you say about the directions of its electric and magnetic field vectors? If the frequency of the wave is 30 MHz, what is its wavelength?

Class 12 Physics CBSE and UP Board Electromagnetic Waves Chapter-8 Exercise 8.4 NCERT Solutions for Class 12 Physics Chapter 8 Question 4

Ashok0210

Asked: March 21, 2021In: Class 12 Physics

What physical quantity is the same for X-rays of wavelength 10⁻¹⁰ m, red light of wavelength 6800 A and radio waves of wavelength 500 m?

Class 12 Physics CBSE and UP Board Electromagnetic Waves Chapter-8 Exercise 8.3 NCERT Solutions for Class 12 Physics Chapter 8 Question 3

Ashok0210

Asked: March 21, 2021In: Class 12 Physics

A parallel plate capacitor (Fig. 8.7) made of circular plates each of radius R = 6.0 cm has a capacitance C=100pF.The capacitor is connected to a 230 V ac supply with a (angular) frequency of to a 230 V ac supply with a (angular) frequency of 300 rad s⁻¹. (a) What is the rms value of the conduction current? (b) Is the conduction current equal to the displacement current? (c) Determine the amplitude of B at a point 3.0 cm from the axis between the plates.

Class 12 Physics CBSE and UP Board Electromagnetic Waves Chapter-8 Exercise 8.2 NCERT Solutions for Class 12 Physics Chapter 8 Question 2

Ashok0210

Asked: March 21, 2021In: Class 12 Physics

Figure 8.6 shows a capacitor made of two circular plates each of radius 12 cm, and separated by 5.0 cm. The capacitor is being charged by an external source (not shown in the figure). The charging current is constant and equal to 0.15 A. (a) Calculate the capacitance and the rate of charge of potential difference between the plates. (b) Obtain the displacement current across the plates. (c) Is Kirchhoffs first rule (junction rule) valid at each plate of the capacitor? Explain.

Class 12 Physics CBSE and UP Board Electromagnetic Waves Chapter-8 Exercise 8.1 NCERT Solutions for Class 12 Physics Chapter 8 Question 1

Ashok0210

Asked: March 21, 2021In: Class 12 Physics

A prism is made of glass of unknown refractive index. A parallel beam of light is incident on a face of the prism. The angle of minimum deviation is measured to be 40°. What is the refractive index of the material of the prism? The refracting angle of the prism is 60°. If the prism is placed in water (refractive index 1.33), predict the new angle of minimum deviation of a parallel beam of light.

Class 12 Physics CBSE and UP Board Ray Optics and Optical Instruments Chapter-9 Exercise 9.6 NCERT Solutions for Class 12 Physics Chapter 9 Question-6

Ashok0210

Asked: March 21, 2021In: Class 12 Physics

A small bulb is placed at the bottom of a tank containing water to a depth of 80 cm. What is the area of the surface of water through which light from the bulb can emerge out? Refractive index of water is 1.33. (Consider the bulb to be a point source.)

Class 12 Physics CBSE and UP Board Ray Optics and Optical Instruments Chapter-9 Exercise 9.5 NCERT Solutions for Class 12 Physics Chapter 9 Question-5

Ashok0210

Asked: March 21, 2021In: Class 12 Physics

Figures 9.34(a) and (b) show refraction of a ray in air incident at 60° with the normal to a glass-air and water-air interface, respectively. Predict the angle of refraction in glass when the angle of incidence in water is 45s with the normal to a water- glass interface [Fig. 9.34(c)].

$Figures 9.34(a) and (b) show refraction of a ray in air incident at 60° with the normal to a glass-air and water-air interface, respectively. Predict the angle of refraction in glass when the angle of incidence in water is 45s with the normal to a water- glass interface [Fig. 9.34(c)].$

Class 12 Physics CBSE and UP Board Ray Optics and Optical Instruments Chapter-9 Exercise 9.4 NCERT Solutions for Class 12 Physics Chapter 9 Question-4

Ashok0210

Asked: March 21, 2021In: Class 12 Physics

A tank is filled with water to a height of 12.5 cm. The apparent depth of a needle lying at the bottom of the tank is measured by a microscope to be 9.4 cm. What is the refractive index of water? If water is replaced by a liquid of refractive index 1.63 up to the same height, by what distance would the microscope have to be moved to focus on the needle again?

Class 12 Physics CBSE and UP Board Ray Optics and Optical Instruments Chapter-9 Exercise 9.3 NCERT Solutions for Class 12 Physics Chapter 9 Question-3

Ashok0210

Asked: March 21, 2021In: Class 12 Physics

A 4.5 cm needle is placed 12 cm away from a convex mirror of focal length 15 cm. Give the location of the image and the magnification. Describe what happens as the needle is moved farther from the mirror.

Class 12 Physics CBSE and UP Board Ray Optics and Optical Instruments Chapter-9 Exercise 9.2 NCERT Solutions for Class 12 Physics Chapter 9 Question-2

A radio can tune in to any station in the 7.5 MHz to 12 MHz band. What is the corresponding wavelength band?

A plane electromagnetic wave travels in vacuum along z-direction. What can you say about the directions of its electric and magnetic field vectors? If the frequency of the wave is 30 MHz, what is its wavelength?

What physical quantity is the same for X-rays of wavelength 10⁻¹⁰ m, red light of wavelength 6800 A and radio waves of wavelength 500 m?

A small bulb is placed at the bottom of a tank containing water to a depth of 80 cm. What is the area of the surface of water through which light from the bulb can emerge out? Refractive index of water is 1.33. (Consider the bulb to be a point source.)

Figures 9.34(a) and (b) show refraction of a ray in air incident at 60° with the normal to a glass-air and water-air interface, respectively. Predict the angle of refraction in glass when the angle of incidence in water is 45s with the normal to a water- glass interface [Fig. 9.34(c)].

A 4.5 cm needle is placed 12 cm away from a convex mirror of focal length 15 cm. Give the location of the image and the magnification. Describe what happens as the needle is moved farther from the mirror.

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