(a(i))[2]
On Fig. 10.1, draw the two reflected rays and mark the image position.
(a(ii))[1]
Apart from its position, state one property of the image.
(b(i))[2]
State what wavefront means.
(b(ii).1)[1]
On Fig. 10.2, draw the reflected wavefronts.
(b(ii).2)[2]
On Fig. 10.2, draw the refracted wavefronts.
(c(i))[2]
A loudspeaker emits sound with frequency $2.0\,\text{kHz}$. Its wavelength in air is $16\,\text{cm}$. Calculate the speed of sound in air.
(c(ii).1)[1]
State the frequency range audible to a healthy human ear.
(c(ii).2)[1]
Calculate the minimum wavelength of sound audible to a healthy human ear.
(c(iii))[3]
Describe a straightforward experiment to demonstrate that sound waves obey the law of reflection. You may include a diagram if you wish.