Ten parsecs is about
A) 150 million kilometers.
B) 10,000 seconds.
C) 10 parallax seconds of angle.
D) 32.6 light-years.
D
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Photographic plates are commonly used by astronomers today
a. True b. False Indicate whether the statement is true or false
Which of the following statements about electrons is not true?
A) Electrons orbit the nucleus rather like planets orbiting the Sun. B) Within an atom, an electron can have only particular energies. C) An electron has a negative electrical charge. D) Electrons have little mass compared to protons or neutrons. E) Electrons can jump between energy levels in an atom only if they receive or give up an amount of energy equal to the difference in energy between the energy levels.
Dark nebulae are opaque to all wavelengths of electromagnetic radiation
Indicate whether the statement is true or false
A car wash nozzle directs a steady stream of water at 1.5 kg/s, with a speed of 20 m/s, against a car window. What force does the water exert on the glass? Assume the water does not splash back
a. 30 N c. 300 N b. 45 N d. 440 N