Comparing the light from a glowing tube of neon gas and the beam of a helium-neon laser, there is a greater number of spectral lines in light from the
A) neon gas tube.
B) laser beam.
C) both about the same
Answer: A
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A child throws a ball with an initial speed of 8.0 m/s at an angle of 40° above the horizontal. The ball leaves her hand 1.0 m above the ground
Neglect air (a) How far from where the child is standing does the ball hit the ground? (b) How long is the ball in flight before it hits the ground? (c) What is the magnitude of the ball's velocity just before it hits the ground?
The ultimate fate of our Sun is to
A) explode in a supernova. B) become a white dwarf that will slowly cool with time. C) become a rapidly spinning neutron star. D) become a black hole.
The average distance from Earth to the Sun is about _____
A) 23 million miles B) 53 million miles C) 73 million miles D) 93 million miles
The density of aluminum is 2700 kg/m3. If transverse waves propagate at in a aluminum wire, what is the tension on the wire?
A) 52 N B) 31 N C) 42 N D) 62 N