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(AST) Spectra/Light
| Question | Answer |
|---|---|
| How do scientists identify and study distant stars and galaxy? | spectroscopy |
| How does spectroscopy help scientists? | helps understand properties, chemical composition, temperature, and motion of stars, gases, and other objects. |
| What are the 3 main types of spectra? | continuous, emission, and absorption |
| What does the continuous spectrum look like? | smooth range of colors. |
| What produces continuous spectrum? | hot, dense objects like stars or incandescent light bulbs |
| What does the emission spectrum look like? | bright-colored lines against a dark background. |
| What produces emission spectrum? | hot, low-density gases |
| How does the emission spectrum happen? | when a stimulated atom reaches high energy levels. Electrons release energy at specific wavelengths as light when it descends to lower energy levels. |
| What does the absorption spectrum look like? | dark lines against a continuous spectrum |
| What produces absorption spectrum? | when "light passes through a cooler gas" |
| How can spectral lines help scientists determine the composition of stars? | they reveal the presence of elements/amounts in the atmosphere ,such as hydrogen, helium, and calcium |
| Do elements absorb and emit light at specific wavelengths due to energy levels? | yes |
| Do unique patterns and the intensity of lines help identify different elements? | yes |
| What is the Doppler Effect of light? | the change in frequency of the light relevant to the observer because of motion between the source of light and the observer. |
| How does the Doppler Effect of light help astronomers? | by calculating and determining the velocity of stars. |
| What helps measure how far a star or galaxy is away from Earth, including the direction of its movement? | redshift and blueshift |
| Do we learn about stars by analyzing the radiation that stars and galaxies, emit, reflect, or absorb? | yes |
| Do we learn about the rotation of galaxies by analyzing the shifts in light? | yes |
| What is redshift? | a concept that shows stretched and longer wavelengths emitted, shifted towards the spectrum's red area |
| What does redshift demonstrate? | the expansion of the universe |
| What is blue shift? | a concept that shows compressed wavelengths, shifted towards the blue end of the spectrum |
| What does blue shift demonstrate? | the close proximity of stars relative to the observer? |
| Does redshift happen when an object is moving away? | yes |
| Does blue shift happen when an object is moving closer? | yes |
| If a galaxy's light is more red-shifted, does it move at a quick rate? | yes |
Created by:
Beia Aria
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