1 markA fixed mass of an ideal gas has a volume V and exerts a pressure p. The absolute temperature of the gas is T. When the gas is heated, the new pressure is 4p.
Which row of the table gives correct values of the new volume and the new temperature?
| Volume | Temperature | |
| A |  |
 |
| B | |
 |
| C |  |
|
| D | |
|
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1 markHelium gas in a closed cylinder is heated until the pressure exerted by the helium is four times the original pressure. The volume occupied by the helium stays constant.
The mean square speed of the helium molecules before heating is 
. The mean square speed of the helium molecules after heating is 
.
What is the ratio 
?
1
2
4
8
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