Waves Quiz 2

Match the following key terms with their descriptions

• Sound with frequency above 20,000 Hz

• Amplitude

• Related to the loudness of a sound wave

• Compression

• Related to the pitch of a sound wave

• Frequency

• Area of a sound wave with low density

• Rarefaction

• Area of a sound wave with high density

• Ultrasound

The diagram shows a loudspeaker. A sound wave is produced between points X and Y. Draw the particles of air as a series of compressions and rarefactions.

Why do we not feel the wind on our ears when we hear a sound?

What is the frequency range of human hearing? Include the unit in your answer.

The diagram shows the air pressure of a sound wave.

Draw and label the wavelength and the amplitude of the sound wave.

Sound travels 5000 m/s in steel. How long does it take for the sound to travel across the 300 meter rail (from the hammer to the man)?

v = d/t

Why do we use ultrasound instead of X-rays to image unborn babies?

When we answered this question we determined that distance = 340 m/s x 5 s.

Where did we get 340 m/s?

When we answered this question we determined that

distance = 340 m/s x 5 s = 1700 m.

Some students left this as the answer. Why are they not correct? What would they have to do to get the correct answer?