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26 June, 03:44

The sun radiates most strongly at a wavelength of about 550 nm. a star that radiated most strongly at 400 nm would be

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  1. 26 June, 03:59
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    550 nm is in the visible spectrum. 400 nm is in the ultra-violet spectrum. The shorter the wavelength, the bigger the energy of the light photon emitted. Therefore a star that emits 400 nm photons, is hotter than the Sun. A star that is hotter is either bigger than the Sun (and has about the same age), either younger than the Sun (and has about the same dimension).

    Therefore a star that radiates at 400 nm would be hotter, bigger and younger than the Sun.
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