Sound Waves and Reflection

Vocabulary flashcards covering key definitions, wave parameters, frequency ranges, and basic mathematical relations from the sound waves section.

Audible range of frequency

The range of frequencies from $20\,\text{Hz}$ to $20,000\,\text{Hz}$ to which human ears are sensitive.

Ultrasonic sound

Sound having a frequency above $20,000\,\text{Hz}$, which is inaudible to human beings.

Infrasonic sound

Sound having a frequency below $20\,\text{Hz}$, which is inaudible to human beings.

Amplitude ($a$)

The maximum displacement of the particle of the medium on either side of its mean position when a sound wave travels through it.

Time period ($T$)

The time taken by the particle of the medium to complete its one vibration.

Frequency ($f$)

The number of vibrations made by the particle of the medium in one second.

Wavelength ($\lambda$)

The distance travelled by a wave in one time period of vibration of the particle of the medium.

Wave velocity ($V$)

The distance travelled by the wave in one second.

Wave velocity relationship equation

The equation relating wave velocity ($V$), frequency ($f$), and wavelength ($\lambda$): $V = f\lambda$

Frequency and time period relationship equation

The equation relating frequency ($f$) and time period ($T$): $f = \frac{1}{T}$