SAT Subject Physics Practice Question 560: Answer and Explanation
1. The specific heat for substance A is twice the specific heat of substance B. The same mass of each substance is allowed to gain 50 Joules of heat energy. As a result of the heating process
A. the temperature of A rises twice as much as B.
B. the temperature of A rises four times as much as B.
C. the temperature of B rises twice as much as A.
D. the temperature of B rises four times as much as A.
E. the temperature of both B and A rise the same amount.
Correct Answer: C
The correct answer is (C). The specific heat capacity of a substance is defined as the amount of heat required to raise l g of the substance by 1°C. If substance A has a specific heat capacity that is twice the specific heat capacity of substance B, that means twice as much heat is required to raise the temperature of substance A as is required for substance B. The converse is also true—the heat required to raise the temperature of substance A by 1°C will raise the temperature of substance B by 2°C.