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💡 Think it over
Hydrogen… no wait — here is the puzzle: two astronauts a metre apart on a spacewalk cannot hear each other clank their tools, yet a whisper carries across the huge dome of the Gol Gumbaz. What decides whether sound reaches us at all?
❓ Think It Over
- Two astronauts repairing a space station during a spacewalk — can they hear each other and the clanking metal as on Earth?
- How do most bats use sound to locate their prey in the dark at night?
In this chapter we will learn about how sound is produced by vibrations, how it propagates through a medium as a wave, how we represent and measure it (wavelength, frequency, time period, amplitude, speed), how we perceive it as pitch and loudness, and how reflection gives us echoes, reverberation, and applications like SONAR and echolocation.
Sound
A form of energy produced by vibrating objects that our ears can sense.
Waves
Sound travels as a wave — a disturbance moving through a medium.
Characteristics
Wavelength, frequency, time period, amplitude and speed describe every sound wave.
Applications
From music and hearing to echoes, SONAR and echolocation.
Topics We Will Study
