Physics (Chapter 9)- Sound and Ultrasound

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1

What is the frequency range for human hearing?

20Hz to 20,000 Hz

2

Sound waves can only travel through a ______, they cannot travel through a _______

medium, vacuum

3

What are the conditions for the reflection of sound

-smooth, hard surface
-Sound is absorbed when it hits a soft, uneven surface

4

How do we increase the pitch of the sound?

By increasing the frequency

5

How do we increase the loudness of the note?

By increasing the amplitude

6

Ultrasound

Sound created above 20,000 Hz

7

Give some uses of ultrasound

Detecting fetuses
Deep sea fishing

8

How does ultrasound work?

-A pulse is emitted from the transmitter and is partially reflected from the different tissue boundaries
-It returns to the transmitter at different times