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12 The Universe
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Gravity
Relativity
Terms in this set (36)
Which of the following quantities do not depend on velocity?
m0
A particle travels at the speed of light. We conclude that
its rest mass is zero
In everyday life, we don't see the effects of relativity because
they are too small to detect easily
In the twin effect, the traveling twin is
younger
Neutrinos are believed to have mass
small but not zero
Tachyons are particles that
travel faster than c
The photon has a rest mass approximately equal to
0
A moving objects is
shorter and younger
If Muller discovers a new energetic particle ("Mulleron") that has zero mass, then we can conclude that it
travels the speed of light
Which of the following is not a zero mass particle?
Beta ray
Tachyons
have never been observed
The speed of a massless particle (trick question)
is the same to all observers
When a particle approaches the speed of light, its mass approaches
infinity
Identify which are the particles that pass easily through the Earth (all that apply)
Neutrinos
The Lorentz contraction says that a football thrown past your face
is shorter by a factor of gamma
The observation of neutrino decay proves that
neutrinos do have mass
A Neutrino can have which of the following values for its energy (tricky)
either of the preceding two values
An astronaut Alice makes a round trip at 3/5 the speed of light. Her twin Bob stays on the Earth. When Alice returns, Bob is
older than Alice
A radioactive particle has a half-life of 1 second. If it moves at 3/5 the speed of light, its new half-life will be
5/4 seconds
The Lorentz contraction refers to the fact that
moving objects get shorter
Jim are Mary Berkeley exact same age. Jim travels at 65 mph to LA and waits. Mary drives next day 70mph. When she gets to LA, who is older?
Jim
If one person travels at 99% the speed of light for 7 years, how much younger will he be than his twin who didn't travel?
1 year
The most accurate equation for energy is
E=mc^2
Jane and Tom synchronize their watches on Earth. Jane remains while Tom makes round trip to Pluto near light speed. When they get back, whose clock is correct
both clocks are correct
We measure that a particle travels at the speed of light. We conclude that
its rest mass is zero
When the velocity of an object with rest mass m0 approaches the speed of light, its energy approaches
infinity
When a person moves at a velocity near the speed of light, which of the following are true, compared to a person at rest? (all that apply)
he doesn't age as rapidly, his mass increases, his energy increases
If you travel at 50% speed of light, your mass is increased by a factor of
1.15
According to relativity theory, the energy of an object of mass m0 that is moving at velocity v is
ym0c^2
As the velocity of a moving object approaches the speed of light, what happens to its energy
it goes to infinity
Electrons cannot go as fast as light because
it would take infinite energy
At very high speed, all of these change except
electric charge
The effects of special relativity must be taken into account for
GPS
If the velocity is (12/13)c, then the gamma function is
13/5
When the velocity of proton is half of the speed of light, then the gamma function is approximately
1.4
When a radioactive rock travels near the speed of light, its mass
increases and there are fewer decays
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