A metal bar is heated at one end. What is the main method by which thermal energy reaches the other end of the bar?
A.
Electrons at the heated end gain kinetic energy and move along the bar.
B.
Electrons at the heated end move apart and set up a convection current along the bar.
C.
Molecules at the heated end gain kinetic energy and move along the bar.
D.
Molecules at the heated end move apart and set up a convection current along the bar.
Exam No：0653_w24_qp_23 Year：2024 Question No：35
Answer:
A
Knowledge points:
P3 Waves
Solution:
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