Choose the correct statements concerning the elec- tromagnetic spectrum given off by stars. (Give ALL correct answers, i.e., B, AC, BCD...) A) If we see a blue star and a red star in a nearby star cluster, we know the red star is hotter. B) Blue photons are more energetic than red photons. C) Hot stars are much brighter than cool stars of the same size and distance from the Earth. D) Blue photons (blue light) have a longer wavelength than red photons. E) A hot star will be more red in color than a cooler star. F) All stars are the same color as our Sun.
Stellar evolution
We may see thousands of stars in the dark sky. Our universe consists of billions of stars. Stars may appear tiny to us but they are huge balls of gasses. Sun is a star of average size. Some stars are even a thousand times larger than the sun. The stars do not exist forever they have a certain lifetime. The life span of the sun is about 10 billion years. The star undergoes various changes during its lifetime, this process is called stellar evolution. The structure of the sun-like star is shown below.
Red Shift
It is an astronomical phenomenon. In this phenomenon, increase in wavelength with corresponding decrease in photon energy and frequency of radiation of light. It is the displacement of spectrum of any kind of astronomical object to the longer wavelengths (red) side.
Choose the correct statements concerning the elec- tromagnetic spectrum given off by stars. (Give ALL correct answers, i.e., B, AC, BCD...)
A) If we see a blue star and a red star in a nearby star cluster, we know the red star is hotter.
B) Blue photons are more energetic than red photons.
C) Hot stars are much brighter than cool stars of the same size and distance from the Earth.
D) Blue photons (blue light) have a longer wavelength than red photons.
E) A hot star will be more red in color than a cooler star. F) All stars are the same color as our Sun.
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