9th Grade Science B - Lesson 6: Waves and Sound Flashcard

Front

What is a mechanical wave?

Back

A wave that requires a medium to travel

Front

Diffraction

Back

The bending of waves around obstacles

Front

What is ultrasound?

Back

Sound waves with frequencies above 20,000 Hz

Front

What is the Doppler effect?

Back

Change in frequency or pitch due to motion

Front

Resonance

Back

When an object vibrates at its natural frequency due to another vibrating object

Front

What does a decibel (dB) measure?

Back

Loudness of sound

Front

How do waves transfer energy?

Back

By moving energy without moving matter

Front

How are transverse and longitudinal waves different?

Back

Transverse: particles move perpendicular; Longitudinal: particles move parallel

Front

In a transverse wave, how do particles move?

Back

Perpendicular to wave direction

Front

In a longitudinal wave, how do particles move?

Back

In the same direction as the wave