With what type of electromagnetic radiation would you observe:
a star with a temperature of 5800 k?
a gas heated to a temperature of one million k?
a person on a dark night?

Green part of the visible spectrum.

X ray part of the electromagnetic spectrum.

Infrared part of the electromagnetic spectrum.

Explanation:

Wien's displacement law

Where, b = Wien's displacement constant = 2.898×10⁻³ mK

T = Temperature in kelvin

So, the wavelength would be of around the green part of the visible spectrum.

So, the wavelength would be of around the X ray part of the electromagnetic spectrum.

Human body temperature = 37°C = 37+273.15 = 310.15 K

So, the wavelength would be of around the Infrared part of the electromagnetic spectrum.

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