Grade 9 Reviewer Sem 2

As the fire truck approached Mary, the pitch of the siren got higher. Once the fire truck passed and moved away, the siren's pitch got lower. This change in pitch is because of a change in the sound wave's

• concussion. 
• amplitude. 
• reflection.
• frequency. 

Which statement about sound waves is true? 

• Air travels with them
• They travel through a vacuum
• They exist only if heard
• They can be reflected. 

If the distance represented by the letter A were increased, how would it change the way the sound was heard?

• The sound would be higher. 
• The sound would be lower. 
• The sound would be softer. 
• The sound would be louder. 

When comparing the two waves that are shown, how would Wave A (green wave) differ than Wave B (black wave)?

• Wave A and B have the same amplitude, but wave B (black) has a lower pitch.
• Wave A and B have the same amplitude, but Wave A has a lower pitch. 
• Wave A and B have the same pitch, but Wave A is a softer sound. 
• Wave A and B have the same pitch, but Wave B is a softer sound. 

What does pitch depend on?

• amplitude 
• frequency
• intensity 
• volume of sound

A wave with a large wavelength will have a ______ frequency and _____ energy

• high, low
• high, high
• low, high
• low, low

When a sound is louder what measurement gets bigger?

• Frequency 
• Amplitude 
• Wavelength 
• Crest

A wave that requires a medium through which to travel

• mechanical wave
• chemical wave
• electromagnetic wave
• pitch

Highest point of a wave

• crest
• trough
• wavelength
• frequency

The number of wavelengths that pass a point each second

• crest
• amplitude
• frequency
• pitch