#### Electromagnetic Waves Three Marks Questions

12th Standard EM

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Physics

Time : 01:00:00 Hrs
Total Marks : 30
10 x 3 = 30
1. The relative magnetic permeability of the medium is 2.5 and the relative electrical permittivity of the medium is 2.25. Compute the refractive index of the medium.

2. Write down Maxwell equations in integral form.

3. Write down the properties of electromagnetic waves.

4. Discuss the source of electromagnetic wave.

5. What is emission spectra?. Give their types.

6. Write the frequency source of production and uses of Ultraviolet radiation.

7. Write the production of gamma rays and mention its properties and uses.

8. A variable frequency ac source is connected to capacitor. How will the displacement current change with decrease in frequency.

9. Identify the Electromagnetic waves whose wavelength vary as
(a) 10-12 m to 10-8 m
(b) 10-4m and write their uses.

10. Identify the following Electromagnetic radiations (a) 109 Hz (b) 1011 Hz. Give one application of each.