Mechanical waves and sound
Answers are for parents and teachers.
1
Frequency 680 Hz, speed 340 m/s. What is the wavelength (m)? (decimal)
0.5
2
Thunder is heard 6 s after lightning (υ = 340 m/s). How far is the lightning (m)?
2040
3
The sea floor is 750 m deep, υ = 1500 m/s. After how many seconds does the echo return?
1
4
The wavelength is 0.5 m, the period 0.002 s. What is the speed (m/s)? (υ = λ/T)
250
5
Give an example of the medical use of ultrasound.
Examining internal organs (ultrasonography), for example the condition of a foetus or liver.