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# Physics ch. 12

Question | Answer |
---|---|

Which of the following quantities do not depend of velocity | m0 |

A particle travels at the speed of light, we conclude that | it's 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 object 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, it's 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 it's 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, it's new half-life will be | 5/4 seconds |

The Lorentz contraction refers to the fact that | moving objects get shorter |

Jim and Mary Berkeley are the exact same age. Jim travels at 65mph to LA and waits. Mary drives the next day at 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 | it's rest mass is zero |

When the velocity of an object with rest mass m0 approaches the speed of light, it's 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 | ym0^2 |

As the velocity of a moving object approaches the speed of light, what happens to it's 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 a radioactive rock travels near the speed of light, it's mass | increases and there are fewer decays |