1. Which of the following theories is probabilistic? a. Newton's Law of Gravity. b. Kepler's Laws of Planetary Motion. c. Quantum Mechanics. d. General Relativity.
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1. Which of the following theories is probabilistic?
a. |
Newton's Law of Gravity. |
|
b. |
Kepler's Laws of Planetary Motion. |
|
c. |
|
|
d. |
General Relativity. |
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- Which of the following is a postulate of special relativity? a. Physicists can make no measurements in a moving reference frame. b. The color of light is the same for all observers. C. The laws of physics are the same for all observers in unformly moving frames of reference. D.The relative speed of two objects is the same for all observers.Which of the following is an INCORRECT description of a consequence of the General Theory of Relativity? a. The elliptical path of Mercury’s orbit is fixed and does not gradually rotate near the Sun. b. The gravitational field of a large cluster of galaxies magnifies the light from distant galaxies. c. The actual position of a star changes when the path of its light bends due to a large mass. d. Black holes have strong gravitational field that nothing, not even light, can escape. Aristotle observed that stars seen in Egypt and Cyprus were not seen in the northerly regions. What is Aristotle’s conclusion for this? a. The sky is a concave firmament enveloping the earth. b. This is possible if the earth has a curved surface. c. The firmament of heaven is curved as mentioned in the Bible. d. The constellations deviate from their position due to rotation.Which of the following is a CORRECT description of a consequence of the General Theory of Relativity? A. Black holes are regions of spacetime where light is emitted in the form of dark energy. B. Gravitational lensing enables us to see the beginning of the universe through redshifts. C. The elliptical path of Mercury is precessing about a certain degree in each century. D. Light is greatly bent by lighter objects than heavier objects due to its small circumference.
- Which of the following statements is true?1. The Special Theory of Relativity considers the effect of gravity to the characteristics of an object moving near the speed of light2. If a source of light is moving away from an observer, the observed wavelength is shorter than the wavelength emitted when the source is at rest. 3. The mass of an object moving at a speed near the speed of light is less than its rest mass. 4. Light travels at a constant speed regardless of the reference frame of the observer.1. For centuries, we accpeted Newton's 2nd Law as the standard model for motion. Then Einstien came along and siggested a modification in cases of high velocity. The Lorenz factor: γ(v)=(1/square-root of 1−(v^2/c^2)) a) The constant (c) is the speed of light, which is 3 * 10^8 m/s. What is the lim as v approaches 400 γ(v)? You will have to track many decimal places to see a difference from 1. A bullet travels 400 m/s; this limit indicates that time dilation is extremely small (and basically negigible) at that speed. b) In the movie Interstellar, time dialation occurs as 1 hour on the water planet corresponds to 7 years on earth. What is the factor γ in this case (what is the ratio of 7 years to 1 hour)? c) If we rearrange the equation for γ and solve for v, we get: v = c square-root of (γ^2 - 1/γ^2) What velocity v is necesary to get the γ you found in part (b)? d) What is the lim as v approaches c γ(v) ?…Energy in the sun is produced by the fusion of four hydrogen atoms into a helium atom. The process involves several steps, but the net reaction is simply 41H → 4He + energy. Given this, you can say thatA. One helium atom has more mass than four hydrogen atoms.B. One helium atom has less mass than four hydrogen atoms.C. One helium atom has the same mass as four hydrogen atoms.
- What is proper time? A. The time calculated for the person moving at relativistic speed. B. The longest possible time interval between two events. C. The time measured by the clock that travels with the observer. D. The time measured by a light clock.1. The second postulate of special relativity states that the speed of light in a vacuum is constant in all inertial frames of reference and is independent of the motion of the source. With this in mind, which of the following statements is NOT true?a. The speed of light is faster for an object that is moving than for an object at rest.b. The speed of light changes depending on the matter by which it travels.c. The speed of light does not change no matter how fast the source by which the light comes from is moving.d. The speed of light does not change regardless of the motion of the observer.23. Which of the following best describes the sentence, “Simultaneity is not absolute.”? a. The laws of physics may be different in different inertial frames of reference. b. Events may appear simultaneous in all frames of reference. c. Events may not appear simultaneous in all frames of reference. .d.The speed of light is not the same in all frames of reference.
- Relativity might seem far removed from daily life, but even some older technologies had to take it into account. The electrons that draw the picture on the screen in an old-fashioned television set are accelerated through a potential difference of 17 kV.a. Calculate the speed of the electrons using the Newtonian formula for kinetic energy.b. Calculate the speed of the electrons using the relativistic formula for kinetic energy.c. By what factor does the Newtonian result exceed the relativistic result?What did Einstein call his greatest blunder? a. introducing a cosmological constant to his equations to balance gravity. b. not believing the evidence that supported quantum mechanics. c. developing the special theory of relativity. d. not studying math and science earlier in school. e. none of the aboveWhich of the following is a CORRECT description of Einstein’s Geometric Theory of Relativity? A. This theory supported Isaac Newton’s description of gravity as a spontaneous force of attraction between two objects with mass. B. This theory implies that the gravitational force of attraction between two objects with mass does not come from gravity itself. C. This theory describes that space and time are eleven-dimensional where each dimension has distinct characteristics and features. D. This theory has two postulates similar to the Special Theory of Relativity that the laws of physics and speed of light are invariant.