Light 1
what are the properties of light
wares or particle, carries lights night mass
Use the inverse law for this example: 5x
25 times away (d1/d2)^2
Why is the sky blue?
Because blue has the shortest wavelength and it scatters so we see it
How does a telescope work?
Focuses on a single point, the bigger it is, the more light it captures
What are the 4 factors when choosing a location to install a large telescope?
Dark skies, clear views, dry outside, no wind
what are the properties of a wave
photons
Explain the electromagnetic spectrum and the categories within it
Shortest: Gamma(blocked by atmosphere)
x-ray(can go through tissue)
UV(sun gets through it)
Visible(we can see it)
Infared(heat signatures)
Microwaves(blocked)
Radio(unblocked)
What is the doppler effect?
If an object is coming towards us, the wavelength is shorter, vice versa
What are the componenets of a telescope?
Eyepiece, lens or mirror, focuser, tripod
Explain why observing objects in IR is a useful astronomy method
Let's us see through dust and gas clouds, see hidden objects
define wavelength and frequency
measured in hz distanced between two peaks, how many waves per second.
Explain how spectroscopy is used in astronomy
Tells us specific wavelengths of light
What is red shift?
Red is moving away from us, longer wavelength
What is chromatic aberration?
Distortion of light due to different colors bending at different angles
What problem happened when the hubble space telescope was launched
The main mirror had an aberration and affected the clearness of the image
What is color? How do we interpret color? what is different about red and blue?
Reflected color, Red= longest wavelength, Blue= shortest wavelength
What is a spectral fingerprint
A pattern of light that identifies what an element is made up of
What is blue shift?
Going closer, shorter wavelength
What are the different types of telescopes? Features? and downsides?
1. Reflecting- uses mirrors-heavier design
2. Refracting-uses lens- potential of chromatic aberration
What is the timeline for the invention of the telescope
1. Hans Lippershey(1608)
2. Galileo(1609)
3. Isaac Newton(1668)
4.William Herschel(1781)
5. Grote Reber(1937)