Which type of reaction is Zn + 2HCl ? ZnCl2 + H2?
a. Decomposition
b. Combination
c. Double-replacement
d. Single-replacement
d
Physics & Space Science
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For what wavelength does a 100-mW laser beam deliver 1.6 × 1017 photons in one second? (c = 3.0 × 108 m/s, h = 6.626 × 10-34 J ? s)
A) 320 nm B) 340 nm C) 330 nm D) 350 nm
Physics & Space Science
Tidal heating is not important for which of the following Galilean moons?
A) Callisto B) Io C) Europa D) Ganymede
Physics & Space Science
In a certain particle accelerator, a proton has a kinetic energy that is equal to its rest energy. What is the speed of the proton relative to the accelerator?
A) 0.25c B) 0.50c C) 0.71c D) 0.75c E) 0.87c
Physics & Space Science
Based on the above graph, the average time between maximums of the sunspot cycle is about
A) 110 years. B) 11 years. C) 1 year. D) a few months.
Physics & Space Science