Sound sources and propagation
Answers are for parents and teachers.
1
A 250 Hz tuning fork vibrates how many times in 6 s?
1500
2
Thunder came 4 s after lightning (340 m/s). Distance in m?
1360
3
How many metres does sound go in water at 1500 m/s in 10 s?
15000
4
Make a matchbox “telephone” and write how string length and tension affect hearing.
With a taut string the sound is clear; with a slack one it is not heard.
5
Why can we hear a train from far away with an ear to the rail?
In a solid sound travels faster and fades less.