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Universe/EM Spectrum
Big Bang Theory and Electromagnetic Spectrum
| Question | Answer |
|---|---|
| How old is the Universe? | 13.8 billion years |
| What happens to frequency as wavelength increases? | frequency decreases |
| What is the single point in which all matter and energy first existed? | singularity |
| The first person to observe galaxies | Edwin Hubble |
| What portion of the EM spectrum causes skin cancer | ultraviolet |
| What portion of the electromagnetic spectrum helps cell phones receive signals | microwave/radio |
| What portion of the electromagnetic spectrum do humans emit? | infrared |
| Which part of the EM spectrum is fastest? | They are all the same speed. |
| Strength of a wave | amplitude |
| Red shift and cosmic background radiation provide evidence for what? | The Big Bang Theory |
| Top of a wave | Crest |
| Bottom of the wave | trough |
| Point on a wave from crest to crest | wavelength |
| If the wavelength of light is stretched then | light is moving away from the observer and is redshifted |
| If the wavelength of light is compressed then | light is moving toward the observer and is blueshifted |
| What is the Doppler Effect? | The frequency of an object's waves increase as it move towards the observer and decrease as they move away from the observer. |
| Where does an electromagnetic wave come from? | vibration of electrons |
| What part of the EM spectrum has the most energy? | gamma rays |
| Where do spectral emission lines come from? | movement of electrons in an element when the atom is energized |
| Spectral lines of a star are useful because | they can tell us how the star is moving or what elements are in the star |
| How many galaxies are in the Universe? | 100 billion |
| What is a measurement of how often waves reach a certain point? | frequency |
| How long have we known about galaxies? | about 100 years. |
| What are the seven parts of the EM spectrum in order from highest to lowest | gamma, x ray, ultraviolet, visible, infrared, microwave, radio |
| What colors make up visible light? which is the highest frequency? which is the lowest frequency | r o y g b v, violet is the highest frequency and red is the lowest frequency |
| Are wave of the EM spectrum mechanical waves? Why? | no, because they do not need a medium, sound is an example of a mechanical wave |
| What are the steps to the big bang theory | hot dense, energy converts to matter, cooling and condensing of subatomic particles, hydrogen, helium, then other elements |
| Was all the matter in the universe created in an instant? | no energy converted into matter, and matter formed as the universe cooled |
| What is a light year | how far light travels in a year |
| What is the speed of light? | 3.00 x 10 to the 8th |
| What's larger an AU or a light year? | light year |
| Organize the following from largest to smallest planet, moon, Sun, galaxy, solar system, universe, red giant star | universe, galaxy, solar system, red giant star, Sun, planet, moon |
| Hubble's Law | All galaxies are moving away from earth showing that the universe is expanding |
| What is nucleosynthesis? | elements being created through nuclear fusion (during big bang or currently in stars) |
| What is faster light or sound waves? | light |
| As frequency increases what happens to energy of the wave? | increases |
| How can parallax be useful to study distances of objects? | using two known observation points and background objects to measure unknown distances |
| What do mechanical waves need to move? | medium (solid, liquid, or gas) |
Created by:
senecairishscience
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