Question

Which best compares radiation and conduction?

Both transfer thermal energy from warm objects to cooler objects.
Both can transfer energy through empty space.
Both transfer thermal energy by electromagnetic waves.
Both involve the transfer of energy through direct contact.

Answer 1

Both transfer thermal energy from warm objects to cooler objects.

Explanation: Conduction moves heat by particle collisions and requires contact; radiation moves heat by electromagnetic waves and can travel through empty space. In both cases net energy flows from the warmer object to the cooler one.