# 001 centimeter a a a and there are 108 ngstroms per

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Unformatted text preview: r, so 0.01 mm = 0.001 centimeter; A A A and there are 108 ˚ngstroms per centimeter, so this is 0.001 × 108 = 105 ˚. the temperature is, then, T= 2.9 × 107 2.9 × 107 = = 290 K λmax 105 2. Sketch the H-R diagram indicating the location of main sequence stars, red giants, and white dwarfs. Label the axes with the correct temperatures and luminosities. Answer: 3. Calculate the energy of a photon of light that has a wavelength of 6000 ˚ngstroms. A The luminosity of the sun is 4 × 1033 ergs/sec. How many photons per second are emitted by the sun (assuming for simplicity that all the sun’s photons have the same 6000 ˚ngstrom wavelength)? A Answer: The energy of a single photon is given by E = hν , so we need to convert the wavelength of the photon to frequency. The wavelength of the photon is λ = 6000 ˚ = 6 × 10−5 cm A 1 The Hertzsprung - Russell Diagram 4 1 0 1 0 11 00 1 11 0 00 1 1 Supergiants 0 0 11 00 1 0 11 00 11 00 11 00 1 0 11 00 11 00 11 11 00 1 0 11 00 000 0 111 00 1 11 0 00 111 000 11 00 11 00 11 0 00 11 0011 1 11 1 0 00 0 111 000 11 00 1 0 1 0 11 1 00 0 11 11 1 00 00 0 11 1 00 0 11 1 11 00 0 00 11 00 11111 00000 11111 00000 11 00 11 1 00 0 111 1 000 0 1 111 111 0 000 000 11 110 1 00 000 0 11 01 00 11 1 0 11 00 10 1 01 0 11 0 11 00 1 1 001 1 0100 0 1 11 1 0 00 0 11 11 00 00 11 00 10 00 11 11 1 1 00 00 0 0 11 11 1 00 0 11 0 00 1 1 11 0100 11 11 1 00 00 0 11 1 00 0 1 0 1 0 11 11 1 00 00 0 11 1 00 0 11 00 00 11 10 1 0110 1 11 0 00 11 1 11 00 0 00 11 00 1...
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