Can sound travel through the vacuum of space?
AnswerNo
Sound needs a medium like air or water to travel.
Science · Facts & stats
Sound facts & stats
7 fact-checked facts about sound, acoustics and hearing, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
What is an echo?
AnswerA reflected sound
An echo is sound bouncing back off a surface.
Going deeper
About how fast does sound travel in room-temperature air?
AnswerAbout 343 meters per second
Sound moves about 343 m/s in air at 20 C.
What is the typical range of human hearing?
AnswerAbout 20 Hz to 20,000 Hz
Young adults hear roughly 20 Hz to 20 kHz.
What property of a sound wave sets its pitch?
AnswerFrequency
Higher frequency means higher pitch.
Expert level
The unit hertz is named after which scientist?
AnswerHeinrich Hertz
Heinrich Hertz proved the existence of electromagnetic waves.
What are sound frequencies below human hearing called?
AnswerInfrasound
Infrasound is below about 20 Hz; ultrasound is above 20 kHz.
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