Electromagnetic Waves and Communication System — Important Questions
Maharashtra Board · Class 11 · Physics
44 important questions from Electromagnetic Waves and Communication System for Maharashtra Board Class 11 Physics, with answers.
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Important Questions from Electromagnetic Waves and Communication System
In an electromagnetic wave, the electric field E and magnetic field B are:
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Perpendicular to each other, Perpendicular to the direction of propagation, In phase with each other
In an EM wave, E and B fields are mutually perpendicular, both perpendicular to the direction of propagation (making EM waves transverse), and they oscillate in phase with the same frequency.
Which waves are used for microwave ovens?
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Microwaves
Microwave ovens use microwaves (frequency ~2.45 GHz) because they are efficiently absorbed by water molecules in food, causing them to vibrate and generate heat through molecular friction.
Calculate the range of a TV transmitter antenna of height 125 m. (Take R = 6400 km)
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40 km
Using the formula d = √(2Rh), where R = 6400×10³ m and h = 125 m. d = √(2×6400×10³×125) = √(1.6×10⁹) = 40×10³ m = 40 km. This is the line-of-sight range.
Which type of waves are primarily used for AM radio broadcasting?
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Ground waves
AM radio (frequency < 2 MHz) uses ground wave propagation. These waves follow the Earth's curvature and are suitable for local broadcasting, though they have limited range due to ground absorption.
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