Chemistry/Physics PS test Time Travel based on Einstein’s theories

1.The theory of Relativity and Einstein’s thoughts on whether time travel is possible or not-
Albert Einstein’s Theory of Relativity is composed of 2 separate theories. It includes both the theories of SPECIAL RELATIVITY and of GENERAL RELATIVITY.

Special Relativity (The first theory created)
the laws of physics are the same for all observers, assuming uniform motion relative to one another, and that the speed of light in a vacuum is the same for all observers regardless of their relative motion or the motion of the light source.

General Relativity
the geometric theory of gravitation. It shows that massive objects cause a distortion in space-time, which is felt as gravity; Einstein extended special relativity to take into account non-inertial frames of reference — areas that are accelerating with respect to each other. Instead of gravitational pull, Einstein suggested that the Earth has curved the space around it, and gravity is pushing down on the Earth’s surface. The Earth is going around the sun because the sun has warped the space around the Earth, pushing it forward and around.
Einstein’s Theory of General Relativity predicted that space-time around earth would be not only warped, but it would also be twisted by the planet’s rotation.

2. How does this relate to the possibility of traveling near the speed of light, or even faster?
Standing still, the speed of light over a specific period of time is constant. So in relation to Einstein’s Special Relativity theory, a surprising thing happens when you move through space-time, especially if your speed is close to that of light. The faster you travel, such as if you increase in speed in a spaceship, the “slower” time will move as you approach the speed in which light moves. Time would not seem to be moving any differently to anyone on the spaceship itself– you wouldn’t notice this effect until you returned to those stationary people, and in the single day you spent traveling at the speed of light, they had aged as much as 50 years back on the earth.

3. Is there any evidence that the “speed of light” is not a constant? Proof?
Unaltered photons in a vacuum will travel at a constant speed along the same unaffected path.
→ Light doesn’t always travel at the speed of light. A new experiment reveals that focusing or manipulating the structure of light pulses reduces their speed, even in vacuum conditions.
→ The researchers produced pairs of photons and sent them on different paths toward a detector. One photon zipped straight through a fiber. The other photon went through a pair of devices that manipulated the structure of the light and then switched it back. Had structure not mattered, the two photons would have arrived at the same time. But that didn’t happen. Measurements revealed that the structured light consistently arrived several micrometers late per meter of distance traveled.

4. According to current scientific theories, should we be able to travel in time?
Time travel, in a way, can be accomplished. If someone is looking to get into a machine and go back in time 50 years to do something, it is not going to happen. However, time travel can be accomplished in that by traveling outside of Earth, at very fast speeds, such as in a spaceship, and then coming back to Earth, would cause time to have passed slower for you in space and for a significant amount of time to pass on the planet while you were gone. You can never travel backwards through time, but you can relatively alter the speed at which time passes for yourself, by traveling at different speeds.

The The Answer

Test Question
1. How many separate theories actually compose Albert Einstein’s Theory of Relativity?
a. 1
b. 2
c. 4
d. 6
b. 2

Test Question
2. The special relativity theory is based on the assumption of _____.
a. relative motion
b. relative space
c. constant time
d. constant energy
a. relative motion

Test Question
3. The theory of general relativity is different from special relativity, because it is based on what specifically?
a. light
b. motion
c. time
d. gravity
d. gravity

Test Question
4. In Einstein’s theory of general relativity, he proposed that gravity created a(n) ____ on the earth’s surface, instead of a ____.
a. pull; push
b. absence of force; pull
c. push; pull
d. absence of force; push
c. push; pull

Test Question
5. Standing still, the speed of light over a specific period of time is _____.
a. relative
b. always changing
c. constant
d. unable to be determined
c. constant

Test Question
6. Einstein’s theory of general relativity predicted that space-time around the earth would be warped by the planet’s rounded surface, as well as twisted by the planet’s ______.
a. rotation
b. size
c. shape
d. none of the above
a. rotation

Test Question
7. According to Einstein, what would happen to the time around you, in relation to everyone else standing on the earth, if you were to travel at the speed of light?
a. it would move more quickly
b. it would move more slowly
c. it would not change
d. unable to be determined
b. it would move more slowly

Test Question
8. A new experiment showed that light may not always be as constant as originally thought. Light’s speed is seemingly reduced inside vacuum conditions when its ____ is altered or manipulated.
a. focus
b. color
c. source
d. structure
d. structure

Test Question
9. According to modern scientists, which of the following is true regarding the idea of time travel today?
a. Scientists have already completed successful time travel experiments.
b. The laws of physics do not allow for time travel.
c. The laws of physics allow for time travel but it is unlikely it will occur.
d. The only proven “direction” for time traveling would be going backwards in time.
c. The laws of physics allow for time travel, but it is unlikely it will ever occur.

Test Question
10. Which of the following is the most accurate representation of the traditional time travel paradox?
a. going back in time and causing nothing to change.
b. going forward in time and visiting your future grandchildren.
c. going back in time and accidentally causing the death of your great-grandfather.
d. the time travel paradox hasn’t been established.
c. going back in time and causing the death of your great-grandfather

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