What electromagnetic waves are used in these applications?
Diagnosing illnesses:
Warming and cooking food:
Transmitting data from remote controls to televisions:
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Diagnosing illnesses: X-rays (used in radiography/CT). — Other EM examples: gamma rays in PET scans and radio waves in MRI (with strong magnetic fields).
Warming and cooking food: Microwaves (microwave ovens use ~2.45 GHz). — Conventional ovens/toasters primarily use infrared thermal radiation.
Transmitting data from remote controls to televisions: Infrared radiation (near‑IR LEDs, typically ~850–950 nm). Some remotes use radio waves (RF) instead for longer range.
Warming and cooking food: Microwaves (microwave ovens use ~2.45 GHz). — Conventional ovens/toasters primarily use infrared thermal radiation.
Transmitting data from remote controls to televisions: Infrared radiation (near‑IR LEDs, typically ~850–950 nm). Some remotes use radio waves (RF) instead for longer range.
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