describe how a microwave oven works (EM waves + thermal physics)

microwaves are Electromagnetic waves with a wavelength in the order of 10^-6m (the prefix for 10^-6 is micro, just as 10^-3 is milli). these short wavelength waves have a high energy due to equation E=hc/λ, showing that energy is inversely proportional to wavelength. The high energy waves incident on the food source, cause molecules on the surface to vibrate. This is due to the exchange of energy, where the energy of the photon has transferred to kinetic energy of the food molecule (mostly water H20 molecules). These surface molecules will then collide with their neighbour molecules, transferring kinetic vibrational energy to their neighbours. This process, known as conduction, disperses kinetic energy throughout the food source. Kinetic energy of a group of many molecules in a system is the definition of thermal energy. therefore, as more microwaves interact with the food, it gains more kinetic energy, and thus gains more thermal energy - the food heats up.  

AE
Answered by Andrew E. Physics tutor

3588 Views

See similar Physics A Level tutors

Related Physics A Level answers

All answers ▸

State Lenz's law and hence describe and explain what happens to a magnet travelling through a metal tube


A cylindrical rod of radius 7mm and Young’s Modulus 70 GPa has a weight F applied to it. The material experiences a strain of 0.2%. What force has been applied?


Can you explain the Work-Energy principle and how you can apply it in a simple situation such as a box sliding down a rough slope?


A stationary observer Bob, observes Alice take 5 seconds to travel from point A to B at 0.95c. How much time does Alice measure the journey from A to B to take?


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

MyTutor is part of the IXL family of brands:

© 2026 by IXL Learning