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| the energy of a photon depends on? |
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| Stimulated emission is important for? |
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| transistors use semiconductors with different? |
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| compact disk readers use? |
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| to tell hydrogen from helium, look at? |
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Definition
| not yet very good at anything |
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| quanta are no observed from water waves because? |
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Definition
| the energy of the quanta are too are too small |
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| Xerox machines make use of? |
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| high temperature superconductors operate at approximately? |
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| lasers are useful because? |
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Definition
| their light is single frequency, they can be well collimated, and they can be made intense. |
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| a laser operates on the principle of? |
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Definition
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Definition
| a device that can amplify or turn AC to DC |
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| The quantum chain reaction refers to? |
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Definition
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| an electron is in orbit around a proton. what is the maximum number of orbits it can be in at the same time? |
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Definition
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Term
| The photoelectric effect is important for all of the following except? |
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Definition
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| superconducting materials allow electrons to move without loss of energy because? |
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Definition
| there are no impurities in the metal |
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| computer circuits are based on which material? |
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Definition
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| which of the following quantities do not depend on velocity? |
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Definition
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| a particle travels at the speed of light. we conclude that? |
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Definition
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| in everyday life, we don't see the effects of relativity because? |
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Definition
| they are too small to detect easily |
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| in the twin effect, the traveling twin is? |
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Definition
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Term
| neutrinos are believed to have mass? |
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| tachyons are particles that? |
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Definition
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| the photon has a rest mass approximately equal to? |
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Term
| if muller discovers a new, energetic particle (the "Mulleron") that has zero mass, then we can conclude that the mulleron? |
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Definition
| travels at the speed of light |
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| which of the following is not a zero-mass particle? |
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Definition
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| the speed of massless particle? |
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Definition
| is the same to all observers. |
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| when a particle approaches the speed of light, its mass approaches? |
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Definition
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| identify which are the particles that pass easily through the earth? |
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Definition
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| The Lorentz contraction says that a football thrown past your face? |
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Definition
| is shorter by a factor of gamma |
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Term
| a neutrino can have which of the follow values for its energy? |
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Definition
| either of the preceding two values (0 joules and 200 joules) |
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Term
| 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? |
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Definition
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Term
| 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? |
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Definition
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Term
| the Lorentz contraction refers to the fact that? |
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Definition
| moving objects get shorter |
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| jim and mary are both from Berkley 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? |
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| 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? |
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Definition
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| the most accurate equation for energy is? |
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Definition
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| jane and tom synchronize their watched to earth. jane remains on earth while tom takes a round trip to pluto at near light speed. when they get back together, whos clock is correct? |
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Definition
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Term
| we measure that a particle travels at the speed of light. we conclude that? |
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Definition
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Term
| when a person moves at a velocity near the speed of light, which of the following are true? compared to a person at rest? |
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Definition
| he doesn't age as rapidly, his mass increases, and his energy increases |
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Term
| if you travel at 50% of the speed of light, your mass is increased by a factor of? |
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Definition
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Term
| according to relativity theory, the energy of an object of mass Mo that is moving at velocity v is? |
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Definition
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Term
| as the velocity of a moving object approaches the speed of light, what happens to its energy? |
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Definition
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Term
| electrons cannot go fast as light because? |
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Definition
| it would take infinite energy |
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Term
| at very high speed, all of theses change except? |
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Definition
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Term
| the effects of special relativity must be taken into account for? |
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Definition
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Term
| velocity is (12/13)c, then the gamma function is? |
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Definition
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Term
| when the velocity of a proton is half of the speed of light, then the gamma function is approximately equal to? |
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Definition
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Term
| when a radioactive rock travels near the speed of light, its mass? |
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Definition
| increases and there are fewer decays |
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Term
| most of the mass of the universe is? |
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Definition
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Definition
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| the Doppler shift for galaxies? |
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Definition
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Term
| the discovery of dark energy means that? |
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Definition
| the expansion of the universe is accelerating |
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Term
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Definition
| there is no center to the universe |
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Term
| what was made in the first 4 minutes after the big bang? |
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Definition
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Term
| to become a black hole, an object must? |
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Definition
| have enough mass that the escape velocity exceeds c |
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Term
| dark energy makes the universe? |
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Definition
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Term
| when you look at a galaxy 5 billion light-years away, you? |
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Definition
| see the galaxy as it was 5 billion years ago |
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Term
| who is famous for his estimate of extraterrestrial intelligence? |
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Definition
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Term
| the expansion of the universe is accelerating. Physicists attribute this to? |
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Definition
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Term
| to make a black hole, we need? |
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Definition
| high mass in a small radius |
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Term
| most of mass in the universe is made of? |
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Definition
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Term
| oxygen and nitrogen were created? |
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Definition
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Definition
| a theoretical star that orbits the sun, making comets and asteroids veer toward earth. |
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| light from the Andromeda galaxy reaches us in? |
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Definition
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Term
| the age of the universe is closest to? |
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Definition
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Term
| for the earth to become a black hole, it would have to be reduced to the size of? |
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Definition
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Term
| for the earth to become a black hole, it would have to be reduced to the size of? |
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Definition
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Term
| if the sun were made into a black hole, its radius would be approximately? |
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Definition
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Term
| if we turn the sun into a black hole, then the force on the earth will? |
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Definition
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Term
| choose all the following that are not part of our solar system: |
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Definition
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Definition
| a large collection of stars |
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Term
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Definition
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Term
| The energy gap is important for? |
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Definition
| superconductivity and transistors |
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Term
| which of the following depend on the energy gap? |
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Definition
| semiconductors, superconductors, and lasers |
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Term
| the observation of neutrino decay proves that? |
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Definition
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