An alpha particle is another name for a helium nucleus
Indicate whether the statement is true or false
T
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What is one of the differences between Cepheids and RR Lyrae variables?
A) The period-luminosity relation holds only for RR Lyrae stars. B) The pulsations of RR Lyrae stars are much less regular than those of Cepheids. C) Cepheids are giants, but RR Lyrae stars are still on the main sequence. D) All Cepheids have the same brightness, but RR Lyrae stars vary greatly in luminosity. E) The RR Lyrae stars have much shorter periods than Cepheids.
Calculate the pressure amplitude (in N/m2) of a 500 Hz sound wave in helium if the displacement amplitude is equal to 5.0 × 10^-8 m. (r = 0.179 kg/m3, v = 972 m/s.)
a. 3.5 × 10^-2 b. 1.6 × 10^-2 c. 2.7 × 10^-2 d. 4.2 × 10^-2 e. 2.0 × 10^-2
A__________is a stellar object with such low mass that it cannot raise its central temperature high enough to sustain hydrogen fusion
A) T Tauri star B) Herbig-Haro object C) brown dwarf D) protostar
If a neutral element has the following chemical symbol, how many electrons does it have?
ImageU A) 92 B) 82 C) 235 D) 143 E) none of the above