Suppose that a comet goes around the sun in an elliptical orbit such that the comet at the farthest point in its orbit is 3 times as far from the sun as it is when it is at its closest point. How many times stronger is the gravitational force on the comet due to the sun when it is at its closest point than when it is at its farthest?
A. 
is the same at both positions.
B. 
times stronger
C. 3 times stronger
D. 9 times stronger
E. 27 times stronger
F. The answer depends on the relative masses of the comet and the sun.
D. 9 times stronger
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A) increases by 2. B) decreases by 4. C) stays unchanged. D) increases by 4. E) decreases by 2.
When the speed of a wave depends on the wavelength (or frequency), the waves are said to exhibit diffraction
Indicate whether the statement is true or false
What are the mass number A and the charge (in units of e) for each of the following particles or rays? (a) beta-plus (b) beta-minus (c) gamma ray
What will be an ideal response?
Which of the following statements about thermal radiation is always true?
A) A hot object emits more radiation per unit surface area than a cool object. B) A cold object produces more total infrared and radio emission per unit surface area than a hot object. C) A hot object produces more total infrared emission than a cooler object. D) All the light emitted by hot object has higher energy than the light emitted by a cooler object.