Waves

Hearing your brother's music playing from down the hall is an example of what type of wave interaction?

• reflection
• interference
• refraction
• diffraction

You and your father inspect an empty house with the hopes of buying it. You walk through the rooms talking to one another, and you notice that your voices and footsteps are echoing in the big, empty house. What causes the echo?

• sound waves reflecting off smooth, flat surfaces throughout the house
• sound waves moving around the large rooms
• sound waves moving slowly through air
• sound waves refracting around corners in the empty rooms

If distance C on the diagram increased, what would happen to the pitch? 

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

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. 

______ is how high or low a sound is; depends on the frequency.

• pitch
• frequency
• sound
• medium

A wave in which the particles vibrate in the same direction as that in which the wave is traveling; sound waves

• longitudinal wave
• ocean wave
• transverse wave
• mechanical wave

A soft, low pitch sound would have which of the following....

• low frequency 
  high amplitude 
• high frequency 
  high amplitude 
• low frequency 
  low wavelength  
• low frequency
  low amplitude 

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. 

A reflected sound wave is know as a/an ___________.

• frequency
• pitch
• echo
• rarefaction

After the train passed, the pitch of the train whistle became lower. This change in sound would be represented by what change in the diagram above? 

• The distance represented by C would increase. 
• The distance represented by C would decrease. 
• The distance represented by D would increase. 
• The distance represented by D would decrease.