Which of the following people used the ideas of quantum mechanics to describe why the spectral classification scheme is in order of decreasing temperature?
A) Annie Jump Cannon
B) Williamina Fleming
C) Cecilia Payne-Gaposchkin
D) Henry Draper
E) Edward Pickering
C) Cecilia Payne-Gaposchkin
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Grass appears green because
A) it emits green light and absorbs other colors. B) it absorbs green light and emits other colors. C) it transmits green light and emits other colors. D) it reflects green light and absorbs other colors.
If you were to cut a small permanent bar magnet in half,
A) neither piece would be magnetic. B) one piece would be a magnetic north pole and the other piece would be a south pole. C) each piece would in itself be a smaller bar magnet with both north and south poles. D) None of these statements is true.
The mass of visible matter in a galaxy can be estimated by measuring its luminosity. When this is compared with the measured mass of the galaxy, astronomers find that ____
a. the measured mass is about ten times the estimated mass, due to the effects of the central black hole b. the measured mass is approximately equal to the estimated mass c. there is no clear relationship between the estimated and measured mass d. the measured mass is about ten times the estimated mass, due to the effects of dark matter e. the estimated mass is about ten times the measured mass, due to the effects of dark matter
A hydrogen atom initially in the n = 6 state decays to the n = 2 state. The emitted photon is detected in a photographic plate
What is the wavelength of the detected photon? The lowest level energy state of hydrogen is -13.6 eV. (h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J, c = 3.00 × 108 m/s) A) 410 nm B) 93.8 nm C) 1090 nm D) 93.1 nm