Homework #5
• Q1 At what wavelength does the spectrum of a 10000 K
type A star peak?
Use Wien’s Law: λ = 3000000 nm/T, so 300 nm.
• Q2 The neutral atom of the most common form of
hydrogen consists of a proton and an electron.
• Q3 Fusion of very light elements to make heavier ones
releases energy, as does fission of very heavy elements to
make lighter ones. The most "energetically favorable" and
stable element from which neither fission nor fusion can
release energy is IRON
• Q5 In the two page spread you can find the solar flare
energy in terms of nuclear weapons (up to a billion H-
bombs), and determine that yes, the traitor dies like the
dog he is!
• Q6 1 kg of mass transformed into energy:
– E = mc2 so E=1 kg x (3x108m/s)2 = 9x1016 J