Physics and technology for future presidents: Chapter 12
the photon has a rest mass approximately equal to
0
The most accurate equation for energy is
E=mc^2
A neutron can have which of the following values for its energy
Either of the preceding two values
At very high speed, all of these change except
Electric charge
The effects of special relativity must be taken into account for
GPS
When a person moves at a velocity near the speed of light, which of the following are true - compared to a person at rest?
He doesn't age as rapidly His mass increases His energy increases
When the velocity of an object with rest mass m0 approaches the speed of light, its energy approaches
Infinity
We measure that a particle travels at the speed of light. We conclude that
It's rest mass is zero
Jim and Mary are both from Berkeley and are the exact same age. Jim travels at a velocity of 65 miles per hour to Los Angeles and waits there. Mary drives the next day at 70 mph. When she gets to Los Angeles, who is older?
Jim
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
identify which are the particles that pass easily through the earth
neutrinos
the observation of neutrino decay proves that
neutrinos do have mass
a moving object is
shorter and younger
Neutrinos are believed to have mass
small, but not zero
in everyday life, we don't see the effects of relativity because
they are too small to detect easily
Tachyons are particles that
travel faster than c
if muller discovers a new, energetic particle (the "mulleron") that has zero mass, then we can conclude that the mulleron
travels at the speed of light
According to relativity theory, the energy of an object of mass m0 that is moving at velocity v is
ym0c^2
in the twin effect, the traveling twin is
younger
If you travel at 50% of the speed of light, your mass is increased by a factor of
1.15
When the velocity of a proton is half of the speed of light, then the gamma function is approximately equal to
1.15
If the velocity is (12/13)c, then the gamma function is
13/5
A radioactive particle has a half-life of 1 second. If it moves at 3/5 the speed of light, it's new half-life will be
5/4 seconds
If one person travels at 99% the speed of light for 7 years, how much younger will he be than his identical twin who didn't travel?
6 years
The lorentz contraction refers to the fact that
moving objects get shorter
which of the following is not a zero-mass particle
beta ray
Jane and Tom synchronize their watches on Earth. Jane remains on the Earth while Tom takes a round-trip to Pluto at near light speed. When they get back together, whose clock is correct?
both clocks are correct
tachyons
have never been observed
When a radioactive rock travels near the speed of light, its mass
increases and there are fewer decays
When a particle approaches the speed of light, its mass approaches
infinity
the lorentz contraction says that a football thrown past your face
is shorter by a factor of gamma
The speed of a massless particle
is the same to all observers
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
a particle travels at the speed of light. we conclude that (be careful, only one answer is correct)
its rest mass is zero
which of the following quantities do not depend on velocity?
m0
