Sound

Question 1

what is frequency

Answer 1

the number of vibrations per second, measured in Hertz (Hz), it determines the pitch

Question 2

What range of sound can humans hear from

Answer 2

20Hz - 20 kHz

Question 3

what is the name given to sound that is above the range of 20Hz - 20kHz

Answer 3

ultrasound

Question 4

what is the amplitude

Answer 4

the distance the object vibrates, ie loudness of it

Question 5

what do sound waves require in order to travel

Answer 5

a medium, therefore they cannot travel through a vacuum

Question 6

which travels slower…sound or light?

Answer 6

sound

Question 7

what are the typical speeds of sound through a solid liquid and air

Answer 7

s: a few km/s
l: 1500m/s
g: 300 m/s

Question 8

the peak in a sinusoidal oscillation wave correlates to what

Answer 8

the area in space where the particles in the air that are close together (compressions)

Question 9

what do the troughs correspond to in a sinusoidal oscillation

Answer 9

the places where the particles in the air are further apart (rarefactions)

Question 10

the distance between two peaks/troughs is called what

Answer 10

the wavelength

Question 11

what can waves be

Answer 11

reflected refracted

Question 12

what is the equation that links frequency to time period

Answer 12

f = 1/t

Question 13

explain why clapping and timing when you hear the clap experiment would not work in a city

Answer 13

as we wouldn’t know which building the echo had come off from, therefore being unreliable. there is also a lot of background noise

Question 14

how to calculate the average speed of sound in air

Answer 14

s= d/t – remember the distance is there and back in some cases