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Practice Listening: Select Missing Word ID: #39951 Medium Microwave
Instructions ›
You will see a video explaining how microwave ovens heat food using microwaves. At the end of the recording the last word or group of words has been replaced by a beep. Select the correct option to complete the recording.

Transcript:

In a microwave oven, an electronic vacuum tube called a magnetron produces short radio waves called microwaves. In most such ovens, these waves travel through a waveguide, a rectangular metal tube, to a stirrer, a fan-like device that scatters the waves around the metal interior of the oven. The waves bounce from wall to wall until they enter the food. Water molecules, which are contained in most foods, are dipolar. That is, they have a positive electrical charge at one end and an equal negative charge at the other. These dipolar molecules act as tiny magnets and as microwaves pass into the food, the molecules are pulled first one way, then the other by a magnetic field created by the waves. This back and forth motion of the molecules occurs nearly 2 1/2 billion times a second. This rapid vibration causes friction between the water molecules, which produces (heat).
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Result:

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Option 4: "heat"

Explanation: The correct answer is 'heat' because the text explicitly states that the rapid vibration of water molecules due to microwaves causes friction, which produces heat. This aligns perfectly with the overall theme of how microwaves cook food.

Option 1: "light"

Explanation: The term 'light' does not relate to the context of the text, which discusses how microwaves generate heat through the vibration of water molecules. Light is not produced by the friction of these molecules.

Option 2: "sound"

Explanation: The option 'sound' is incorrect because the text focuses on the generation of heat from the friction of water molecules, not sound. While sound can be produced in some cooking processes, it is not the primary outcome described here.

Option 3: "electricity"

Explanation: The word 'electricity' is not suitable in this context. The text explains how microwaves create heat through molecular vibration, not electricity. Electricity is not mentioned as a product of this process.

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