How does a stretched string,on being set into vibration,produce an audible sound?

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

What is the audible range for human beings?

State whether the following statement is true or false: The velocity of sound in air is higher for higher frequencies than for lower frequencies.

What are elastic waves? Name two kinds of elastic waves.

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?