Geography Blog
Physics - Bats and dolphins use echolocation to navigate or the find food
Bats and dolphins use echolocation to navigate or the find food or to find their way without relying on sight. The frequencies they use are
A) supersonic
B) infrasonic
C) ultrasonic
D) microsonic
Answer:
C) ultrasonic
Both bats and dolphins use ultrasound with frequencies of about 50 kHz and above.
Physics - Light and sound are both waves. You can see a ringing bell
Light and sound are both waves. You can see a ringing bell inside an evacuated glass container but you can not hear it. This is because
A) of resonance
B) light travels faster than sound
C) sound requires air to be transmitted and light does not
D) light passes through glass but sound does not
Answer:
C) sound requires air to be transmitted and light does not
Physics - How will the frequency of the sound used for echolocation affect
How will the frequency of the sound used for echolocation affect the size of objects that can be detected? Will higher or lower frequencies allow for detection of smaller objects with echolocation?
Answer:
The wavelength of a wave determines how it will be reflected. The shorter wavelengths of higher frequencies mean that the echolocation of bats and dolphins help them identify more detail -- or smaller objects -- than would be possible with longer wavelengths or lower frequencies.
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