If the density of a medium through which sound is propagating is minimum,then this point is called:

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?

For hearing the loudest ticking sound by the ear:
$(a)$ Find the angles $x$ and $y$ in the figure below.
$(b)$ Name the phenomenon observed here.
$(c)$ State the laws of the phenomenon.

For hearing the loudest ticking sound of the clock,find the angle $x$ in the figure. (in $^o$)

$(a)$ What are the basic factors on which the speed of sound in a medium depends?
$(b)$ Why are sound waves called mechanical waves?
$(c)$ How will you differentiate a high-pitch sound from a low-pitch sound with the help of a graph?

Write true or false for the following statement: The distance between a crest and the next trough in a wave motion is $\lambda / 4$.