PHYSICS · Single correct · CBSE · Physics · Thermal Properties of Matter · Thermal Properties of Matter
Problem
Two identical, rigid, sealed bulbs containing the same gas are connected by a valve that is initially closed. Bulb A is at 300 K, and Bulb B is at 600 K. The bulbs are otherwise thermally isolated from the surroundings. When the valve is opened, which statement best describes what happens to thermal energy in the system?
(a) Thermal energy is transferred from Bulb A to Bulb B because the lower-pressure gas in Bulb A absorbs energy to raise its pressure.
(b) No net transfer of thermal energy occurs; the system is isolated, so energy cannot be redistributed between the two bulbs.
(c) Thermal energy is transferred from Bulb B to Bulb A because particles in Bulb B have a higher average kinetic energy.
(d) Thermal energy flows equally in both directions as molecules pass through the valve, so neither bulb experiences an overall energy change.