When you increase the frequency of a sound wave, what happens to the pitch?

Both frequency and wavelength will change. We perceive an increase of frequency as the increased pitch that you described. As the frequency (pitch) increases, the wavelength becomes shorter according to the universal wave equation ( v=fλ ).

Explanation:

mass of ship = volume x density

= 4000 x 7900 = 316 x 10⁵ kg

The ship must displace water equal to weight of ship that is 316 x 10⁵ kg .

If volume of displaced water be V .

V x 10³ is mass of displaced water

V x 10³ = 316 x 10⁵

V = 31600 m³.

b ) Now the volume of steel making ship is only 4000 m³ so if it is in the form of a lump , it will displace only water equal to its volume ie 4000 m³ . So in order that it may displace water equal to volume 31600 m³ , it must be given shape so that it is hollow .