☰ Contents · Physics

Properties of sound and echo

Lessons 65–66 · 2 lessons · N.Sh. Turdiyev. Physics Grade 6, 3rd revised edition. Niso Poligraf Publishers, Tashkent, 2017
Answers are for parents and teachers.
1
An echo returns in 6 s (340 m/s). Distance in m?
2
An echo sounder signal returns in 2 s (1500 m/s). Depth in m?
3
A body vibrates 800 times in 2 s. Frequency in Hz?
4
Give one place where an echo is heard and one where it is not.
5
At home tap different vessels and note which sounds are higher and which lower.