Question:
The type of electromagnetic waves that are produced due to rapid acceleration and deceleration of electrons in aerials is:
The type of electromagnetic waves that are produced due to rapid acceleration and deceleration of electrons in aerials is:
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Electrons accelerated in antennas produce EM waves. Low-frequency oscillations yield radio waves; high-frequency oscillations produce X-rays or gamma rays. Wavelength and frequency determine the type of EM radiation.
Updated On: Jun 19, 2026
- X-rays
- Radio waves
- Microwaves
- Gamma-rays
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The Correct Option is B
Solution and Explanation
Step 1: Recall the general source of EM waves.
Electromagnetic waves are produced whenever charged particles accelerate or decelerate. The type of wave depends on the frequency of oscillation.
Step 2: Consider electrons in aerials.
In an antenna (aerial), electrons oscillate back and forth due to an alternating current. Their motion is relatively slow, corresponding to low-frequency oscillations.
Step 3: Frequency determines wavelength.
Low-frequency oscillations correspond to long wavelengths. EM waves produced have wavelengths from meters to kilometers.
Step 4: Match frequency to EM wave type.
Long wavelengths (low frequency) correspond to radio waves in the electromagnetic spectrum. X-rays and gamma rays have very short wavelengths (high frequency). Microwaves are intermediate.
Step 5: Reasoning about rapid acceleration.
Although the electrons undergo rapid acceleration, the rate is within the low-frequency AC in the antenna. Hence, the emitted radiation is in the radio frequency range.
Step 6: Conclusion.
Therefore, the EM waves emitted by oscillating electrons in aerials are radio waves.
Step 7: Physical interpretation.
Radio waves can propagate over long distances, making them suitable for communication, which is why oscillating charges in antennas are used for broadcasting and reception.
Electromagnetic waves are produced whenever charged particles accelerate or decelerate. The type of wave depends on the frequency of oscillation.
Step 2: Consider electrons in aerials.
In an antenna (aerial), electrons oscillate back and forth due to an alternating current. Their motion is relatively slow, corresponding to low-frequency oscillations.
Step 3: Frequency determines wavelength.
Low-frequency oscillations correspond to long wavelengths. EM waves produced have wavelengths from meters to kilometers.
Step 4: Match frequency to EM wave type.
Long wavelengths (low frequency) correspond to radio waves in the electromagnetic spectrum. X-rays and gamma rays have very short wavelengths (high frequency). Microwaves are intermediate.
Step 5: Reasoning about rapid acceleration.
Although the electrons undergo rapid acceleration, the rate is within the low-frequency AC in the antenna. Hence, the emitted radiation is in the radio frequency range.
Step 6: Conclusion.
Therefore, the EM waves emitted by oscillating electrons in aerials are radio waves.
Step 7: Physical interpretation.
Radio waves can propagate over long distances, making them suitable for communication, which is why oscillating charges in antennas are used for broadcasting and reception.
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