chapter 12 - sound

Question 1

compression

Answer 1

regions where the air pressure is higher than the surrounding pressure

Question 1

sound

Answer 1

i) form of energy produced when there is a vibration
ii) transmitted as longitudinal waves (consisting of a series of compression and
rarefaction)
iii) requires a medium to travel

Question 2

rarefaction

Answer 2

regions where the air pressure is lower than the surrounding pressure

Question 3

factors affecting speed of sound

Answer 3

i) temperature increases, speed of sound increases
ii) humidity increases, speed of sound increase

Question 4

ultrasound

Answer 4

very high frequency sound waves above 20kHz range of human hearing

Question 5

change in sound due to change in amplitude/frequency

Answer 5

frequency increases, pitch increases
amplitude increases, loudness increases

Question 6

how are sound waves produced in the air by a vibrating tuning fork?

Answer 6

when the tuning fork is stationary, the particles in the air are “undisturbed”. when the prongs move outwards, layers of air are pushed close together so that a compression of the air particles is formed. when the prongs move inwards, the air layers are pulled apart causing a rarefaction of the air particles.

Question 7

speed of sound in solid vs gas

Answer 7

travels fastest in solid and travels slowest in air