How do the frequency and amplitudes affect a musical sound?

What change,if any,would you expect in the characteristics of musical sound when we increase $(i)$ its frequency and (ii) its amplitude?

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?

What is an echo? When can we distinctly hear the echo of a sharp sound? Why cannot we hear an echo in small halls?

An echo is returned in $6$ seconds. What is the distance of the reflecting surface from the source (in $, m$)? [Given that the speed of sound is $342 \, m s^{-1}$]

The distance between the crest and trough of a transverse wave is $15 \, cm$. What is the velocity of the wave if its frequency is $1000 \, Hz$?