Astronomy Questions: Mostly concerning Spectra and blue/red-shift?
Have a little homework to do over the weekend.. Can’t find these answers anywhere online. I could realllly use help on these thirty (pretty much) yes, no, or very short answers.
29) Spectrum is light intensity vs. frequency in ASCENDING or DESCENDING order?
30) Photon A has wavelength twice the wavelength of B; compare their energies.
31) Photon A has frequency three less than the frequency of star B; compare their energy.
32) Photon A at 400 MHz; photon B at 200 Mhz: compare their energies.
33) Photon at 2 nm; another photon at 6mm: compare their energies.
35) The sun’s spectrum during a solar eclipse is continuous: true or false?
36) Who discovered the Emission spectrum of hydrogen?
37) who discovered the emission spectrum from the ground state?
38) out of the emission spectra for hydrogen: which one is in the shortest wavelength?
39) a Bohr’s atom electron descends from the 3d level to the 1st one; another one descends from the 3d level to the 2nd one; which one is more energetic?
40) Which one has the shortest wavelength? (from question above)
41) Are focal lengths in curved mirrors?)
42) In a Schmidt-Cassegrain, where is the image of a star: at the focal plane of the primary or the eye piece?
43) How can we see through dust clouds in Astronomy? Via Short or Long wavelengths?
44) A green-light photon is scattered from particle to particle in a dust cloud: does it go through a Doppler shift?
45) a radio-frequency photon through a dust cloud undergoes a red-shift; true or false
46) Scattering of a wavelength causes blue-shift; true or false?
47) Red-shift is caused by: a) scattering b) refraction c) reflection?
48) 3% redshift of Ha line corresponds to what speed of a star?
49) 30km/s speed corresponds to Ha shift equal to —– what %?
50) star A has three times the solar radius, and it is 24000 degrees: what is its normalized luminosity?
51) Repeat for a Star 10 times the solar radius and Temp 44000 degrees
52)A star’s relative luminosity is 10000; its max wavelength is 167 nm. what is its size (radius) compared to the sun’s?
53) How many advantages of RF telescopes do you know?
54) We can see through dust clouds by means of RF telescopes. Explain why.
Help on ANY of these would be greatly appreciated!! Cheers.
30) Photon A’s energy is 4 times as strong as photon B. Thus increasing in wavelength (obviously) Thus causing a blue-shift
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