The color of a star is determined by its temperature; the hottest stars are _ and the coolest stars are _______ in color.

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Blue and white

White and red

Blue and red

Blue and yellow

answer is C.

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Detailed Solution

Concept- Atomic energy held in the nucleus at the heart of each atom is used by stars to fuel nuclear processes that result in light. Stars get extremely hot as a result of internal reactions, and depending on their temperature, they shine in various colors
Because certain atoms and molecules vibrate or move in denser gas, stars generate electromagnetic radiation at all wavelengths. As a result, in collisions, some atoms and molecules travel slower than average while some atoms and molecules move faster than average. Therefore, we observe the spectrum of wavelengths and energy coming from stars that are producing electromagnetic radiation.
Now, compared to the item at lower temperature, the object at greater temperature emits more power at shorter wavelengths. Accordingly, a hotter star produces more energy at shorter wavelengths than a colder star.
Keep in mind that the wavelength at which the greatest power is released will be shorter the higher the temperature. High frequency and energy are also associated with shorter wavelengths. It implies that a hotter star than a cool star produces more energy at short wavelengths.
The shorter wavelength of blue color indicates a hotter star, whereas the longer wavelength of red color indicates a colder star.
As a result, the reddest stars are the coldest and the bluest stars are the warmest.
Hence, the correct option is 3.

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