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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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| To tell hydrogen from helium, look at |
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| not yet very good at anything |
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| The energy gap is important for (choose all that are correct) |
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Definition
| spectral fingerprinting, superconductivity, transistors |
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| Quanta are not observed in water waves because |
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Definition
| the energy of the quanta 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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| their light is a single frequency, they can be made intense |
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| A laser operates on the principle of |
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| a device that can amplify or turn AC to DC |
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| The quantum chain reaction refers to |
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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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| Which of the following depend on an energy gap? |
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Definition
| semiconductors, superconductors |
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| The photoelectric effect is important for all of the following except |
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| Superconducting materials allow electrons to move without loss of energy because |
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| Computer circuits are based on which material |
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| Which of the following quantities do not depend on velocity? |
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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 only occur when near c |
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| Neutrinos are believed to have mass |
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| Tachyons are particles that |
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| The photon has a rest mass approximately equal to |
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| 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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| The speed of massless particle |
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| 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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| Identify which are the particles that pass easily through the Earth |
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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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| The observation of neutrino decay proves that |
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| A neutrino can have which of the following values for its energy? |
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| 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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| 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 |
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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 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? |
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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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| The most accurate question for energy is |
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| 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? |
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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 the velocity of an object with rest mass m0 approaches the speed of light, its energy approaches |
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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 |
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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 the relativity theory, the energy of an object of mass m0 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 as 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 these 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
| If the velocity is (12/13)c, 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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Term
| 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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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 this galaxy as it was 5 billion years ago |
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| 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
| in the Big Bang (aka by God) |
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Term
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Definition
| a theoretical star that orbits the Sun, making comets and asteroids veer toward the Earth |
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Term
| Light from the Andromeda Galaxy reaches us in |
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Definition
| several millions of years |
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Term
| The age of the Universe is closest to |
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Definition
| 10 billion years (yeah...right) |
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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, 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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