What defines a sound wave with higher frequency?

• A. Longer wavelength
• B. Higher amplitude
• C. More cycles per second
• D. Lower pressure

Answer: (C)

A sound wave with a higher frequency is defined by the number of cycles it completes in one second, which is referred to as its frequency. Frequency is measured in hertz (Hz), and when we say that a sound wave has a higher frequency, we are indicating that it oscillates more times per second compared to a sound wave with a lower frequency.

In the context of sound waves, a higher frequency corresponds to a shorter wavelength, which means the distance between successive peaks of the wave is reduced. This characteristic describes the pitch of the sound; higher frequencies generally produce higher-pitched sounds that we perceive, such as a whistle, while lower frequencies are associated with deeper sounds, like a drum.

While amplitude does affect the loudness of the sound (higher amplitude means louder sound), it does not define frequency. Similarly, while lower pressure can be associated with softer sound, it is not a defining factor of frequency either. Hence, the relationship between sound waves and frequency hinges on the number of cycles per second, making this the correct answer.