A student heats a bar of chocolate in the microwave for one minute. When they remove the bar they observe that there are patches of melted chocolate with unmelted chocolate between them. Suggest the mechanism of how this happens.
This question is about standing waves, the bar of chocolate melts only in the positions where antinodes are formed on the standing wave as they transfer the most energy as they have the greatest amplitude of vibration, the unmelted parts are where nodes were formed along the standing wave, points of zero amplitude.
HD
Related Physics A Level answers
All answers ▸What is the difference between electromotive force and potential difference?
If a vehicle A, 1000kg moving at 5m/s collides with vehicle B, 750kg, moving in the opposite direction at 8m/s assuming no rebound what is the velocity of the vehicles after collision.
During take-off from earth, an astronaut of mass 76kg has an area of contact with his seat of 0.095m^2. Calculate the average pressure on the seat when the upward acceleration of the rocket is 47ms^-2
What is the threshold frequency of a photon to excite and then emit photoelectrons from a material?