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11.

Write the dimensions of 1/μ0ϵ0  

12.

What is the wavelength of a television station, which transmits vision on 500 MHz?

13.

The oscillating magnetic field in a plane electromagnetic wave is given by By = 8 x 10-6 sin [2 x 1011t+ 300 πx]. Calculate the wavelength of the wave.

14.

Why can light travel in vacuum whereas sound cannot do so?

15.

What are infrared rays? Write their two uses.

16.

How infrared rays are detected? Write the name of instrument also.

17.

What is common between different types of em waves?

18.

Find the amplitude of the electric field in parallel beam of light of intensity 8 Wm2

THREE MARKS QUESTIONS

19.

Draw a labeled diagram of Hertz experimental setup to produce electromagnetic waves. Explain the generation of electromagnetic waves using this setup.

20.

Prove that electromagnetic waves are transverse in nature.

21.

What is meant by em spectrum? Give its four uses.

22.

Write the order of frequency range and one use of the following radiations.

(i)

Microwaves

(ii)

Ultraviolet rays

(iii)

X rays

23.

Why did Maxwell introduce the concept of displacement current? How does the concept of displacement current lead to the production electromagnetic waves?

24.

A plane electromagnetic wave of frequency 25 MHz travels in free space along X direction. At a particular point in space at time . What is at this point?

25.

Give two uses each of the following

(a)

Gamma ray

(b)

Infrared rays

(c)

Ultraviolet radiations

26.

Give the frequency range and source of production of X rays. Also write two uses of it.

27.

Prove that (i)

(iii)

FIVE MARKS QUESTIONS

28.

A parallel plate capacitor has plates of area 0.32 m2, which are separated by a distance of 5 mm. The capacitor is raised to a potential of 1200 V. Estimate the average value of ID, when it is discharged for 1 μ s.

29.

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

30.

About 5% of power of a 100W bulb is connected to visible radiation. What is the average intensity of visible radiation (a) at a distance f 1 m from the bulb and (b) at a distance of 10 m. Assume that the radiation is emitted isotropically and neglect reflection.

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