The spectacular image called "Einstein's Cross" is direct evidence of which of the following phenomenon
d.
The four outside images represent light bent by an intervening quasar.
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Which of the following elements in your body is formed in stars?
A. calcium B. carbon C. oxygen D. iron E. All of these choices are correct.
The explanation of the behavior of light based on the ray model is called "geometric optics."
Indicate whether the statement is true or false
According to Einstein, is a frame at rest on the earth’s surface a reasonably accurate inertial frame (ignoring the earth’s rotation)?
A. No, such a frame is accelerating upward. B. It is not a real inertial frame, but we can treat it as one if we ignore external gravitational forces acting on objects inside the frame. C. Yes. D. It depends (explain).
Which of the following best describes the size and distance relationship of our Sun and the nearest star?
A) A tennis ball here, another on the Moon B) Two beach balls separated by 100 city blocks C) Two grains of sand separated by 100 light-years D) Two golf balls separated by 300 kilometers E) Two baseballs separated by 100 yards