Question

Microwave oven acts on the principle of:

Answer 1

Hint: Here we will know about how a microwave oven works and why it works only when its door is closed and why does heat not come out even when the door is made of glass.Microwave ovens use less energy and cook food faster than gas or electric ovens, so they've found a place in most households.

Complete answer:
The microwave's secret lies in the microwaves themselves. Microwave radiation is used in these applications, which has a frequency of about 2.4GHz and a wavelength of around 4 inches (10.16 cm). These electromagnetic waves, which are produced in a system known as a magnetron, excite water. When a microwave reaches a water molecule, it absorbs the energy. This enthusiasm causes the water to heat up and flow faster.

And, as the sun expands, hot water in your food means hot food. This is why microwaves are so effective at reheating food: instead of heating the food from the outside, like a conventional oven might, they heat the water inside the food, which allows it to heat up faster and more evenly.Microwaves often penetrate the food, allowing it to be heated from inside.

Within the clear glass panel, you'll notice a grid of wires. These are attached to the oven's metal walls and prevent microwaves from escaping. One of the strange quirks of radiation is that much of it cannot pass into a hole smaller than the wavelength of the radiation. The microwaves are trapped inside the oven by this metal cage, which bounces them from wall to wall until they encounter anything that can consume them.

Hence, a microwave oven acts on the principle of giving rotational energy to the water molecules.

Note: Broadcast TV antennas are often made of wire grids: the grid appears to the radiation as a solid surface since, as previously said, if a hole is smaller than the wavelength of the radiation, much of it will not pass through the hole.