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Exam 1
Key values and equations
34
Astronomy
Undergraduate 1
10/04/2007
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Term
λmax of sun
 Definition
500 nm or 5000 A
Term
Temperature of the Sun
 Definition
6000 K
Term
Distance Earth to Sun
 Definition
1.5 x 10^8 km or 1 AU
Term
V circ at Earth's surface
 Definition
8km/sec
Term
Radius of Earth
 Definition
6400 km
Term
Radius of Sun
 Definition
110(REarth)
Term
Distance Alpha Centauri
 Definition
4.3 LY
Term
c
 Definition
3 x 10^5 km/s
Term
λ Hα
 Definition
6563 A
Term
1 degree
 Definition
60' 3600"
Term
Visible Light
 Definition
400 nm to 700 nm (red)
Term
EM spectrum
 Definition
GXUVIR
Term
distance =
 Definition
rate x time
Term
Circumfrence
 Definition
2 pie r
Term
Surface area of sphere
 Definition
4 pie r^2
Term
Volume of sphere
 Definition
4/3 pie r^3
Term
1 m
 Definition
10^9 nm, 10^10 A
Term
1 yr
 Definition
= approx. pie x 10^7 sec
Term
1 rad
 Definition
57.3 degrees or 206265"
Term
small angle formula
 Definition
s = theta/57.3 degrees
Term
Peak wavelengh
 Definition
λmax = 2.9 x 10^6 nmK/T
Term
Force of Gravity
 Definition
F = GM1M2/d^2
Term
Flux(brightness)
 Definition
F = L/4pied^2
Term
Power
 Definition
F = sigma x T^4
Term
Wavelenght
 Definition
Wavelength = speed/velocity = c/v
Term
Planck's constant
 Definition
h = 6.63 x 10^-34 joule/sec
Term
Energyof photon
 Definition
E = hf or hc/lambda
Term
Kinetic energy
 Definition
1/2 mv^2
Term
Sigma
 Definition
5.67 x 10^-8W/(m^2K^4)
Term
Circular velocity
 Definition
square root(GM/r)
Term
Escape Velocity
 Definition
square root(2) v circ
Term
Force of gravity
 Definition
mg
Term
Period
 Definition
P = circum. orbit/v circ
Term
Diffraction limit
 Definition
theta = 2.5 x 10^5arcsec(lambda/D)
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