a.

150 J

b.

100 J

c.

50 J

d.

200 J

a.

Increased vibration of the molecules of the liquid about their mean position

b.

Variation of density of the liquid

c.

Expansion of the liquid as it is heated

d.

Latent heat of vaporization of the liquid

a.

Decreasing the loudness

b.

Increasing the amplitude

c.

Increasing the frequency

d.

Decreasing the intensity

a.

Temperature and purity

b.

Purity and age

c.

Temperature and age

d.

Age, purity and temperature