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As @john-rennie have state out. Shorter wavelength tend to absorb and heat the outer layer of object. Microwave using long wavelength to penetrate to inside and also it use the property of dipole moment of water molecule to heat things, not directly heat by let object absorb energy If we just use short wave then you can only get burnt outside and raw inside ...


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In microwave ovens what matters is how much energy the radiation carries and how that energy is absorbed by the food. Visible light and IR are rapidly absorbed by most foods, so they would only heat the outer layer of the food. You'd get food with the outside carbonised and the inside raw. Microwaves are far less strongly absorbed by foods, so they ...


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The solar spectrum looks like the image below. The yellow shaded curve is the observed spectrum at the top of the atmosphere while the red curve is what we get at ground level. The black line is a blackbody model of the sun (a pretty good approximation, just don't worry about the yellow curve peaking above the black line) (source) 940 nm occurs right ...



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