astrophysics

Question 1

what is the relationship between the maximum radiation [or wavelength] emitted by a star and it’s temperature?
ASTRO

Answer 1

λmax ∝ 1/T

where:
• T = temperature of the star

Question 2

what is the equation for the doppler shift, using λ, f, v and c?
ASTRO

Answer 2

Δλ / λ = Δf / f ≈ v / c

where:
• λ = wavelength
• f = frequency
• v = recessional velocity
• c = speed of light

Question 3

what is the equation for the Hubble constant, using: v and d?
ASTRO

Answer 3

v = H0d

where:
• v = recessional velocity
• d = distance

Question 4

what is the equation for the age of the universe?
ASTRO

Answer 4

age of universe = 1 / H0

where:
•H0 = hubble’s constant

Question 5

what is the equation for d, using: θ?
ASTRO

Answer 5

d = 1 AU / sinθ

where:
• d = distance from earth to a nearby star
• 1 AU = 1 astronomical unit
• θ = angle of star from earth

Question 6

what is the equation for parallax, using: d?

Answer 6

p = 1 / d

where:
• d = distance from earth to a nearby star
• p = parallax [: the apparent change in position of an object relative to a fixed background when viewed from a changing angle]