sound travels faster in steel than in water. Suggest difference an explanation for this [2] (b) Traces of two different sound waves, S1 and 52, are drawn on the same scale in Fig. 8.1 S1 S2 3 time time Fig. 8.1 State two ways in which S1 differs from S2 [2]

Abag of potato chips contains 2.00 l of air when it is sealed at sea level at a pressure of 1.00 atm and a temperature of 20.0 deg c. what will be the volume of the air in the bag if you take it with you, still sealed, to the mountains where the temperature is 7.00 deg c and atmospheric pressure is 70.0 kpa? assume that the bag behaves like a balloon and that the air in the bag is in thermal equilibrium with the outside air.