When an electron in a hydrogen atom drops from the second to the first excited energy state it emits a bright red emission line called hydrogen alpha
Indicate whether the statement is true or false
TRUE
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Stars in the central bulge of the galaxy follow elongated orbits tipped steeply to the plane of the disk
a. True b. False Indicate whether the statement is true or false
The root-mean-square speed (thermal speed) of the molecules of a gas is 200 m/s at 23.0°C. At 227°C the root-mean-square speed (thermal speed) of the molecules will be closest to
A) 160 m/s. B) 330 m/s. C) 260 m/s. D) 630 m/s. E) 2000 m/s.
The redness of the lunar eclipse is due to
A) refraction of sunsets and sunrises all around Earth. B) infrared light continually emitted by the Moon. C) scattering of lower frequencies of light by the Moon. D) dim light that is incident upon the Moon by Jupiter and other planets.
Two waves travel simultaneously through the same medium. The first wave is described by y1(x,t) = (2.00 cm)cos[kx-?t] and the second wave by y2(x,t) = (3.00 cm)cos(kx-?t+?). If the resulting wave has an amplitude 4
00 cm, what is a possible value of ?? A) 0.782 rad B) 0.250 rad C) 0.644 rad D) 0.833 rad E) 1.32 rad