+2 Physics
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TEST (electromagnetic waves) TIME: 1HR
M.M: 20
Q.NOS. 1 – 3 ARE OF 1 MARK EACH 1. Give one use of gamma radiations. 2. Which part of the electromagnetic spectrum does the wavelength 10 –10 m correspond to? 3. Arrange the following electromagnetic radiations in the ascending order of wavelength: microwaves, γ-rays, radio waves, and ultraviolet light. Q.NOS 4 – 7 ARE OF 2 MARKS EACH 4. Explain the green house effect. 5. A variable frequency a.c. source is connected to a capacitor. Will the displacement current increase with increase in frequency? Explain. 6. Mention four important properties about electromagnetic waves. 7. Show electromagnetic waves are transverse in nature. Q.NOS 8 – 10 ARE OF 3 MARKS EACH 8. State and explain Maxwell’s modification of Ampere circuital law. 9. In a plane e.m. wave, the electric field oscillates with a frequency of 2 × 1010 Hz and amplitude 48 V/m. (a) What is the wavelength of the wave? (b) What is the amplitude of the oscillating magnetic field? 10. Electromagnetic waves travel in a medium with a speed of 2.0 × 108 m/s. The relative permeability of the medium is 2.0. Calculate the relative permittivity.
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M.M: 20
Q.NOS. 1 – 3 ARE OF 1 MARK EACH 1. Give one use of gamma radiations. 2. Which part of the electromagnetic spectrum does the wavelength 10 –10 m correspond to? 3. Arrange the following electromagnetic radiations in the ascending order of wavelength: microwaves, γ-rays, radio waves, and ultraviolet light. Q.NOS 4 – 7 ARE OF 2 MARKS EACH 4. Explain the green house effect. 5. A variable frequency a.c. source is connected to a capacitor. Will the displacement current increase with increase in frequency? Explain. 6. Mention four important properties about electromagnetic waves. 7. Show electromagnetic waves are transverse in nature. Q.NOS 8 – 10 ARE OF 3 MARKS EACH 8. State and explain Maxwell’s modification of Ampere circuital law. 9. In a plane e.m. wave, the electric field oscillates with a frequency of 2 × 1010 Hz and amplitude 48 V/m. (a) What is the wavelength of the wave? (b) What is the amplitude of the oscillating magnetic field? 10. Electromagnetic waves travel in a medium with a speed of 2.0 × 108 m/s. The relative permeability of the medium is 2.0. Calculate the relative permittivity.
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