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In the context of physical methods to control microbial growth, which type of electromagnetic wave is commonly used to kill bacteria on food by causing heating through molecular vibration?
A
Ultraviolet (UV-C) light
B
Microwaves
C
Gamma rays
D
Infrared radiation
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1
Understand that electromagnetic waves can control microbial growth by different mechanisms, such as damaging DNA or causing heating.
Identify that ultraviolet (UV-C) light primarily kills bacteria by causing DNA damage, not by heating through molecular vibration.
Recognize that gamma rays are high-energy waves that kill microbes by ionizing molecules and damaging cellular components, not mainly by heating.
Know that infrared radiation causes heating by increasing molecular vibration, but it is less commonly used specifically for killing bacteria on food compared to microwaves.
Conclude that microwaves are the type of electromagnetic wave commonly used to kill bacteria on food by causing heating through molecular vibration, which disrupts microbial cells.