Astronomy/Physics multiple choice problem: Sorry that there are 10 small questio

Question

Astronomy/Physics multiple choice problem:

Sorry that there are 10 small questions, but this is a important quiz, I need to make sure I am right;

No explation is necessary. Thank you very much!

Light has both particle and wave properties True False Save Question 2 (2 points) Light is not affected by gravity because it has no mass O True False Save Question 3 (2 points) In the twin paradox, Bob stayed on Earth and Alice traveled to a far away star at close to the speed of light, and then returned. Which of the following is true? O Alice did the moving so her clock ran slower. Alice is younger, Bob is older. O Bob did the moving so his clock ran slower. Bob is younger, Alice is older O Alice underwent acceleration leading to Alice being younger. Bob is older O They are the same age Save Question 4 (2 points) How can you tell the difference between a gravitational field and acceleration in the absence of gravity? O a) You cannot, the equivalence principle states, "acceleration is the same as being stationary in a gravity field, no matter what." Gravity will be different from place to place giving rise to tidal forces that can be measured. Tidal forces will not be present in the acceleration frame in the absence of gravity b) You could perform an experiment in which you drop a hammer and a feather from the same height at the same time. In gravity the hammer will hit first O d) It depends on your reference frame

Explanation / Answer

1- true

2-true (Actually light is affected by high gravitational fields, because in that case space time is curved, so light moves along that. but this bending is no where related to mass)

3-Alice underwent accelation, so alice is younger and bob is older (Twin paradox is a concept in STR. In GTR, this fails and both must have same ages)

4- it depends on reference frame

5- both a and b

6- all of the above

7- both a and b

8- false (speed of light is constant in GTR also and this constant is eual to c)

9- slow

10- true

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