When the amplitude of a wave becomes double its energy become_________________?
Correct answer: B. Four times
- A. Double
- B. Four times
- C. One half
- D. None time
Explanation
The energy carried by a wave is proportional to the square of its amplitude, E ∝ A². If amplitude changes from A to 2A, the energy becomes (2A)²/A² = 4 times the original energy. The common mistake is choosing a because the amplitude itself doubled, while wave energy depends on amplitude squared.
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About Progressive Waves
Progressive waves transfer energy through a medium or space while particles oscillate about their equilibrium positions. The work includes amplitude, wavelength, frequency, period, phase difference, wave speed and the progressive wave equation, while distinguishing travelling waves from stationary waves, where the pattern has fixed nodes and antinodes.
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