Question

elastic objects respond dramatically when subject to sound waves with frequencies known as

multiple choice

subsonic frequencies.

ultrasonic frequencies.

harmonic frequencies.

resonant frequencies.

Explanation:

Resonance occurs when an object is subjected to a frequency that matches its natural frequency. Elastic objects show a dramatic response (large - amplitude vibrations) at resonant frequencies. Subsonic frequencies are below the range of human hearing (below 20 Hz). Ultrasonic frequencies are above the range of human hearing (above 20,000 Hz). Harmonic frequencies are integer multiples of a fundamental frequency. But the key concept here is resonance, where the response is maximum at a particular frequency called the resonant frequency.

Answer:

resonant frequencies.