Nature of Light Blackbody Radiation 1 Which is hotter A They are the same 2 Which star gives off more energy 3 Which star gives off more red light A Star A A Star A 4 Which star looks red A Neither 5 Which star emits more green light A They are the same 6 Which star is larger A B Star D 7 The darker the hotplate the cooler the temperature Which hotplate would be giving off more energy and thus able to boil a pot of water faster A Cannot tell from the info given 8 Betelgeuse and Rigel have the same luminosity but Rigel is much hotter Which one is bigger A Betelgeuse 9 Rigel and Sirius B have the same temperature Rigel is much larger than Sirius B Which star is more luminous A Rigel 10 You observe three stars one red one white and one blue The white one is the brightest and the blue is the faintest Which of the following is true A The red star is larger than the blue 13 Energy is released from atoms in the form of light when electrons A Move from high energy levels to low energy levels Spectra as Fingerprints 14 If an electron moves from an orbit with an energy of 5 to an orbit with an energy of 10 which of the following happens A A photon of energy 5 is absorbed 11 Which is the smallest 12 Which star is the largest B E B A D 15 Which atom would be emitting the lowest energy light 16 Which atom would be absorbing the bluest light 17 When a source is moving away from you the Doppler effect causes the light to A Shift toward longer wavelengths The Doppler Effect 18 A bright star is moving toward Earth If you were to look at the spectrum of this star what would it look like A An absorption spectrum that is blueshifted relative to an unmoving star 19 You observe the two redshifted spectra shown below Which of the following statements best describes the motions of the two sources A Source B is moving faster than A Greater shift the faster the velocity 20 Which of the following wavelengths of light is most effectively blocked by Earth s Telescopes atmosphere A Gamma following reasons A 21 Some telescopes are placed in space above Earth s atmosphere primarily for which of the Astronomers want to observe continuous spectra from stars rather than absorption spectra I think but I missed this lecture Imagine two light bulbs both are 60 watts as indicated by the color and are the same distance from the observer Absolute and Apparent Brightness 22 Which one gives off more light A They are the same 23 Which on appears brighter to the observer A They are the same Imagine two light bulbs both are 60 watts as indicated by color but one is much farther from the observer 24 Which one gives off more light A They are the same 25 Which one appears brighter to the observer A A Now imagine two light bulbs one is 40 watts A the other is 120 watts B and they are the same distance from the observer 26 Which one gives off more light 27 Which one appears brighter to the observer A B A B Again imagine two light bulbs one is 40 watts A the other is 120 watts B but the 120 watt bulb is much farther away 28 Which one gives off more light A B 29 Which one appears brighter to the observer A Cannot tell Do not know exactly how much farther away B is than A 30 Which one looks brighter A Venus with m 4 4 31 Which one looks brighter A Vega with m 0 03 32 Why do stars have different apparent brightnesses a Some stars are intrinsically brighter b Stars are different distances A Both A and B 33 You observe two stars Earl and Bob Earl has a larger parallax than Bob Which one is farther away A Bob 34 To measure an unknown star s parallax angle accurately you should observe a star s location against background stars A On many nights over the course of a year 35 Star X is 10 parsecs away and Star Y is 50 parsecs away Which star has a greater parallax angle A Star X Star X A 1 10 an arcsecond 36 Star X is 10 parsecs away and Star Y is 50 parsecs away What is the parallax angle for 37 Leroy has apparent mag m 1 1 and absolute mag M 1 1 Gibbs has m 3 72 and M 5 0 From which one does the Earth receive more light A Leroy 38 Star G has an apparent mag of 5 0 and an absolute mag of 4 0 Star H has m 4 0 and M 5 0 Which of the following statements is true when viewing the star from Earth A Star H will appear brighter than Star G 39 Vega has an apparent mag of 0 03 and an absolute mag of 0 58 Which of the following statements is true A Vega is less than 10 pc away Stellar Spectra 40 Luke is a star with an A0 spectral type and M 4 1 Han is an A0 star with M 1 5 Which star is hotter A They are the same temperature Which star is intrinsically brighter A Luke 41 Luke is a star with an A0 spectral type and M 4 1 Han is an A0 star with M 1 5 42 Luke is a star with an A0 spectral type and M 4 1 Han is an A0 star with M 1 5 Which star appears brighter A Cannot tell Need to know the distance 43 Which star is hotter a B7 or an A3 A B7 The star Rigel is about 100 000 times brighter than the Sun and belongs to spectral type B8 The star Sirius B is about 3000 times dimmer than the Sun and also belongs to spectral type B8 44 Which star has the greatest surface temperature A They have the same temperature 45 Which star is bigger A Rigel 46 Which of the following statements is always true for two stars that might have the same absolute magnitude A They have the same luminosity 47 What would happen to the Earth s temperature if the sun suddenly stopped emitting light A Heat trapped in the atmosphere would keep Earth warm for a while Our Star the Sun 48 What would happen to the Earth s temperature if we drastically increased the amount of CO2 in the atmosphere A The CO2 would trap in heat from the surface warming Earth considerably B We cannot increase the CO2 enough to change anything 49 A sunspot is a region on the surface of the sun that is the photosphere of the Sun A Cooler and dimmer than 50 When we observe the sun we see an absorption spectrum because A The photosphere gets cooler as you go from close to …