4.1

Question 1

How is sound caused?

Answer 1

Sound is caused by the vibration of particles moving in a wave-like motion.

Question 2

What happens when an object vibrates?

Answer 2

When an object vibrates, the vibration causes particles in the air to compress together (compression) and then move apart (rarefaction) in a longitudinal wave.

Question 3

Define amplitude.

Answer 3

The amplitude of a wave is the maximum distance it extends beyond its middle position.

Question 4

Are sound waves latitudinal or longitudinal?

Answer 4

Sound waves are longitudinal.

Question 5

What is wavelength and how is it measured?

Answer 5

Wavelength is the distance between the same point on adjacent waves. Wavelength is measured in metres.

Question 6

What is frequency, how is it measured and how does it affect pitch?

Answer 6

Frequency is the number of waves produced each second.

Frequency is measured in Hertz (Hz). Sounds with higher frequency have a higher pitch.

Question 7

What is ‘f’ in a wave formula?

Answer 7

‘f’ is frequency in a wave formula.

Question 8

What is ‘v’ in a wave formula?

Answer 8

‘v’ is velocity in a wave formula.

Question 9

What is ‘λ’ in a wave formula?

Answer 9

‘λ’ is wavelength in a wave formula.

Question 10

How do you calculate frequency (f) in a wave formula?

Answer 10

Frequency (f) = Velocity (v) / Wavelength (λ)

Question 11

How do you calculate velocity (v) in a wave formula?

Answer 11

Velocity (v) = Frequency (f) * Wavelength (λ)

Question 12

How do you calculate wavelength (λ) in a wave formula?

Answer 12

Wavelength (λ) = Velocity (v) / Frequency (f)