The colorful effects that we see when viewing a compact disc (CD) are due to
A. The different colors embedded in the CD
B. The absorption of certain colors
C. The close spacing of the tracks which act as a diffraction grating
C. The close spacing of the tracks which act as a diffraction grating
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The most important reason an object is observed to be shorter in a frame where it is moving than in a frame where it is at rest is that
A. The force of motion strongly compresses an object that is moving at relativistic speeds. B. “Simultaneity” is not a frame-independent concept. C. The measuring sticks used by the moving observer are Lorentz-contracted. D. The clocks used by the moving observer run slower.
Why are supermassive galaxies often found at the cores of rich galaxy clusters?
A) Most of the matter forming the cluster fell into the center to form one large galaxy. B) They are the result of many galactic mergers; one galaxy growing at the expense of others. C) Such a large galaxy attracted smaller galaxies around it to form a cluster. D) Large galaxies, passing a cluster, get captured into the center. E) Many globular clusters swarmed together to form it.
What are the limitations to travelling between stars?
What will be an ideal response?
You stand near the Earth's equator. A positively charged particle that starts moving parallel to the surface of the Earth in a straight line directed east is initially deflected upwards. If you know there are no electric fields in the vicinity, a possible reason why the particle does not initially acquire a downward component of velocity is because near the equator the magnetic field lines of the
Earth are directed a. upward. b. downward. c. from south to north. d. from north to south. e. from east to west.