Question

The type of electromagnetic waves that are produced due to rapid acceleration and deceleration of electrons in aerials is:

• A. X-rays
• B. Radio waves
• C. Microwaves
• D. Gamma-rays

Hint:

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.

Answer 1

The Correct Option is B

Step 1: Origin of electromagnetic waves.
Accelerating charges emit EM radiation; the oscillation frequency dictates the wave type.

Step 2: Electron motion in aerials.
Alternating current drives electrons back and forth at relatively low frequencies.

Step 3: Wavelength–frequency link.
Low-frequency oscillations produce long wavelengths, ranging from meters to kilometers.

Step 4: Spectrum classification.
Such long-wavelength radiation falls under radio waves.

Step 5: Acceleration context.
Although electrons undergo rapid acceleration, the AC frequency remains within the radio band.

Step 6: Conclusion.
The emitted EM waves are radio waves.

Step 7: Practical significance.
Radio waves propagate over large distances, making them ideal for communication via antennas.