Mr K Physics Ch 12 Sound/Harmonics

Which of the following best describes "sound"?

• vibrations that travel through the air or another medium and can be heard with our ears

• electromagnetic waves that travel through the air or another medium and can be heard with our ears

• vibrations that travel through the air or another medium and cannot be heard with our ears

• the movement of waves through a medium

Which type of wave is sound?

• rarefaction

• longitudinal

• transverse

• electromagnetic

Vibrating objects push the air molecules together, forming a ​ (a)  

• compression
• rarefaction
• node
• wavelength

Vibrating objects spread air molecules apart, forming a ​ (a)  

• rarefaction
• compression
• node
• wavelength

The troughs in the sine curve correspond to what, in the sound wave image above it?

• compressions

• rarefactions

• amplitudes

• wavelengths

Frequencies audible to humans are between ________

• 10 Hz and 20 000 Hz

• 0 Hz and 30 000 Hz

• 20 Hz and 20 000 Hz

• 200 Hz and 20 000 Hz

Infrasound frequencies are lower than _______

• 20 Hz

• 200 Hz

• 0 Hz

• 20,000 Hz

Ultrasound refers to frequencies that are greater than _________

• 20 000 Hz.

• 20 Hz

• 10,000 Hz

• 0 Hz

"Pitch" is best described as ...

• the human perception of how high or low a sound appears to be

• the measurable intensity of how high or low a sound is

• the "loudness" of a sound

• how long or short the "wavelength" of a sound wave is

Pitch is primarily determined by ________

• frequency

• wavelength

• amplitude

• intensity