Physics (Chapter 9)- Sound and Ultrasound
What is the frequency range for human hearing?
20Hz to 20,000 Hz
Sound waves can only travel through a ______, they cannot travel through a _______
What are the conditions for the reflection of sound
-smooth, hard surface
-Sound is absorbed when it hits a soft, uneven surface
How do we increase the pitch of the sound?
By increasing the frequency
How do we increase the loudness of the note?
By increasing the amplitude
Sound created above 20,000 Hz
Give some uses of ultrasound
Deep sea fishing
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