The distance between two consecutive crests in a wave is known as:

The stem of a tuning fork is pressed against a table top. Answer the following questions:
$(i)$ Would the above action produce any audible sound?
$(ii)$ Does the above action cause the table to set into vibrations?
$(iii)$ If the answer above is yes,what type of vibrations are they?
$(iv)$ Under what conditions does the above action lead to resonance?

Write true or false for the following statement: Sound produced by a sounding body of frequency $300 \text{ Hz}$ covers $34 \text{ m}$ in the time the sounding body produces $30$ vibrations.

If the amplitude of a wave is doubled, what will be the effect on its loudness?

Which of the following sound waves can we hear? $10 \, Hz, 500 \, Hz, 1500 \, Hz, 12000 \, Hz, 25000 \, Hz$

What is Galton's whistle? To what use can it be put?