## Sound and Ultrasound Questions

1)A bat sends out signals with a frequency
of 20 000Hz.
a) If the wavelength of the sound wave is
200m, how fast does it travel?

b) It fires the signal at a rock 10m away, how long will it take to receive the signal?

c) Another bat sends out a signal with a frequency of 20 500Hz. Is this a lower or higher pitched signal?

2) A sound wave is sent out from a loud speaker and reflected off a wall 5m away. It takes 3s to hear the sound.

a)What is the total distance travelled?

b)What is its speed?

c)The wavelength is 0.3m, what is its frequency?

3) In a 12 week scan, the ultrasound had a frequency of 2MHz. The speed of sound is 300m/s.

a)If the depth of the womb is 5cm, how long would it take for sound to reach the baby?

b) How long would it take the signal to reach the detector?

c) What is the wavelength of the ultrasound?

b) It fires the signal at a rock 10m away, how long will it take to receive the signal?

c) Another bat sends out a signal with a frequency of 20 500Hz. Is this a lower or higher pitched signal?

2) A sound wave is sent out from a loud speaker and reflected off a wall 5m away. It takes 3s to hear the sound.

a)What is the total distance travelled?

b)What is its speed?

c)The wavelength is 0.3m, what is its frequency?

3) In a 12 week scan, the ultrasound had a frequency of 2MHz. The speed of sound is 300m/s.

a)If the depth of the womb is 5cm, how long would it take for sound to reach the baby?

b) How long would it take the signal to reach the detector?

c) What is the wavelength of the ultrasound?