Students were investigating methods of thermal energy transfer by cooking popcorn using four different methods.

Question

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Which method(s) of cooking popcorn involves the transfer of thermal energy through conduction?

a Only 1

b Both 1 and 4

c Only 2

d Only 4

Answer 1

d Only 4 (since method 4 involves placing the popcorn kernels in direct contact with a hot surface, which is an example of conduction)