What is the temperature of a star (in kelvin) if its peak wavelength is 150 nm (that is, 150 x 10^-9 m)?

19320 K

Explanation:

The temperature of a star is related to its peak wavelength by Wien's displacement law:

where

T is the absolute temperature at the star's surface

is Wien's displacement constant

is the peak wavelength

Here we have

Substituting into the equation, we find

an ion is a charged atom or molecule. it is charged because the number of electrons do not equal the number of protons in the atom or molecule. an atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.