sound waves

the waves in front of a moving sound source have

• a longer wavelengths than trailing waves

• a higher pitch than the waves behind

• different properties than trailing waves

• the same amplitude as the waves behind it

a 10 dB increase in loudness represents

• a twofold increase in intensity

• a fourfold increase in intensity

• a tenfold increase in intensity

• a hundredfold increase in intensity

loudness describes

• the energy and intensity of a sound wave

• the decibel level of sound wave

• a danger to public health

• your awareness of a sound's energy

when your vocal cords relax, you produce sound waves with

• lower frequencies and lower pitches

• lower frequencies and higher pitches

• higher frequencies and higher pitches

• higher frequencies and lower pitches

the loudness of different sounds is compared in units called Hertz (Hz)

• true

• false

the farther apart a sound wave and its source are, the less energy the sound wave has in a given area

• true

• false

the diffusion theorem explains a change that occurs in the frequency of a wave as its source moves in relation to an observer

• true

• false

a sound source vibrating with a large amplitude produces a sound wave with a(n) small amplitude

• true

• false

the less energy a sound wave has, the softer it sounds

• true

• false

sounds louder than 60 dB can cause damage to your ears

• true

• false