Question

determining how thermal energy is transferred
when a fork is placed in a hot piece of lasagna, thermal energy is transferred up the fork by
○ fast - moving particles travelling along the fork.
○ fast - moving particles changing places with slow - moving particles.
○ fast - moving particles colliding with slow - moving particles.
○ fast - moving particles colliding with other fast - moving particles.

Explanation:

When a fork is placed in hot lasagna, heat transfer occurs via conduction. In conduction, fast - moving particles (in the hot part of the fork) collide with slow - moving particles (in the cooler part of the fork). This collision transfers kinetic energy (thermal energy) from the hot region to the cooler region. Particles do not travel along the fork (so the first option is wrong). They also do not change places (second option wrong) and it is the collision between fast and slow - moving particles, not fast and fast (fourth option wrong).

Answer:

fast - moving particles colliding with slow - moving particles.