Question

The speed of molecules is indirectly related to a measurement called _____.
heat flow,
temperature,
friction,
energy,

Answer 1

The average speed of all the molecules in an object
or sample of a substance is related to its temperature ...
and not indirectly at all.
 

Answer 2

Answer : (c) temperature is the correct option.

Explanation :

The speed of molecules is directly proportional to temperature. If the temperature of the system is increased, the molecules start vibrating i.e. their kinetic energy increases which in turn increase its velocity.

From kinetic theory of gases,

$v_{rms}=\sqrt{\dfrac{3\ RT}{M}}$........(1)

where,

R is the gas constant

T is temperature

M is molar mass

So, from equation (1) it is clear that velocity is directly proportional to temperature.

Hence, the correct option is (B) " temperature"