The spectrum of the hydrogen atom differs from the spectrum of the helium atom due to
A) their different energy levels.
B) the different frequencies of their emitted photons.
C) Both of the above.
D) Neither of the above.
C
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Indicate whether the statement is true or false
Why was the summer of 2003 a fine time for Mars observers?
A) The Mars Rovers returned live images from the surface. B) The skies were unusually clear and calm. C) Mars' north pole was tilted to face the Earth head-on. D) Mars was closer to us than it has been in over 50,000 years. E) Mars was even brighter than Venus for several weeks.
The remnant left behind by a white-dwarf supernova is a neutron star
Indicate whether the statement is true or false
A proton of mass m is at rest when it is suddenly struck head-on by an alpha particle (which consists of 2 protons and 2 neutrons) moving at speed v
If the collision is perfectly elastic, what speed will the alpha particle have after the collision? (Assume the neutron's mass is equal to the proton's mass.) A) zero B) 2v/3 C) 3v/5 D) 5v/3