When the Moon is described as tidally locked, that means that it does not rotate
Indicate whether the statement is true or false
FALSE
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A helium-neon laser emits red light having a wavelength of 632.8 nm and a power of 1.85 mW. How many photons are emitted each second? (h = 6.63 × 10^?34 J?s, c = 3.00 × 10^8 m/s, and 1 nm = 10?9 m)
a. 5.9E+15 b. 3.7E+34 c. 5.9E+24 d. 5.9E+18 e. 1.2E+17
Sagittarius A* was first noted due to its strong ________ emissions
A) radio B) X-ray C) ultraviolet D) infrared E) gamma ray
If there are 146 neutrons in 238U, how many neutrons are found in the nucleus of 235U?
a. 141 b. 143 c. 145 d. 147
Astronomers know what the solar interior is like by
A. constructing a miniature Sun in the laboratory and extrapolating the results to the real Sun. B. using locally tested physics combined with observations to build a mathematical model of what the Sun should be like in its interior. C. observing the interior directly. By using the appropriate filters, it is possible to reduce the bright glow of the Sun and to peer directly at the Sun's interior. D. sending probes directly into the Sun and sending back the information.