A vibrating string has a little sound. However, when attached to a board the sound has a greater intensity. This is because?
Correct answer: B. The sound is concentrated over smaller area
- A. The string vibrates with more energy
- B. The sound is concentrated over smaller area
- C. The speed of sound is greater in board
- D. The energy leaves the board at a greater rate
Explanation
The correct answer is (b) The sound is concentrated over a smaller area. When the string is attached to a board, the board acts as a soundboard, which means it resonates and amplifies the sound produced by the vibrating string. This amplification is due to the larger surface area of the board compared to the string. The board is better at displacing air and producing sound waves, resulting in a greater intensity of sound being heard when compared to the sound produced solely by the vibrating string without the board.
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About Simple Harmonic Motion
Simple harmonic motion is oscillation in which acceleration is directly proportional to displacement and directed toward the equilibrium position. Work includes displacement, velocity, acceleration, phase, period, frequency, amplitude and energy, with applications to springs and simple pendulums. The restoring force and the conditions for SHM distinguish it from general periodic motion.
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