ASTR 102 Exam Questions With Answers 2024 New Update
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Module
ASTR 102
Institution
ASTR 102
ASTR 102 Exam Questions With Answers 2024 New Update
What is wavelength? - Answer -Distance between two crests
What is amplitude? - Answer -Distance between crest and resting position
What is period? - Answer -Time between one crest and the next one
What is the frequency of a wave? - An...
ASTR 102 Exam Questions With
Answers 2024 New Update
What is wavelength? - Answer -Distance between two crests
What is amplitude? - Answer -Distance between crest and resting position
What is period? - Answer -Time between one crest and the next one
What is the frequency of a wave? - Answer -Number of oscillations that pass by per
second (1/Period)
How do you calculate wave speed? - Answer -wavelength x frequency
Electric field and magnetic field oscillate in the same direction or opposite direction? -
Answer -Opposite
What is the definition of a perfect blackbody? - Answer -Perfectly absorbs all radiation
that hits it
What wavelengths do blackbody emit? - Answer -All wavelengths
Electrons that are further away from the nucleus require more or less energy? - Answer
-More energy
What causes absorption lines? - Answer -When electrons move to higher excitations,
they absorb photons of a specific energy level
What causes emission lines? - Answer -When electrons drop from higher excited states
to lower excited states and release the leftover energy in a photon
What are the three steps in the cycle of experimentation? - Answer -Theory, Prediction,
Observation
What is causes random error? - Answer -uncertainties in obtaining data
What causes systematic error? - Answer -Accuracy of the measurement, issues with
calibration
High precision but low accuracy means what in terms of error? - Answer -Low random
error but high systematic error
Low precision but high accuracy mean what in terms of error? - Answer -High random
error but low systematic error
, What three things are properties of theories? - Answer -- Must be falsifiable
- Make a prediction
- Be observable
What must experiments have? - Answer -- Able to disprove the theory
- Be as unbiased as possible
- Be reproducible and repeatable
What is the difference between refracting and reflecting telescopes? - Answer -
Refracting telescopes use lenses to bend the light and reflecting use mirrors
What device is used to digitize light into images in optical telescopes? - Answer -
Charged Coupled Devices
How is the amount of light mirror collect related to the diameter of the mirror? - Answer -
The amount of light is proportional to the diameter squared.
How do you calculate resolution limit? - Answer -1.22 x (observed wavelength) /
(diameter of telescope)
What does the term "seeing" refer to? - Answer -The amount of blue from the air.
What is adaptive optics used for? - Answer -To re-focus mirrors in real time as the
atmosphere changes
What is diffraction? - Answer -When waves pass through a small opening and bend
around it.
What is refraction? - Answer -When light bends due to passing into a different medium.
When light enters a denser medium which way does it direct? - Answer -Away from the
interface
When light enters less dense medium which way does it direct? - Answer -Toward the
interface
What is the doppler effect? - Answer -Redshift/Blueshift
What are photons? - Answer -light particles or "wave packets" containing energy
What is the photoelectric effect? - Answer -Light excites electrons to generate electrical
current
How does the intensity of light affect the photoelectric effect? - Answer -Higher intensity
of light results in more electrons (current)
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