Atomic clock used in spaceships

In summary, Einstein said a balance clock is preferred. A pendulum clock is dependent on gravity and not good.
  • #1
AnilML
2
0
Hi,
Not sure how stupid my question might be. Could anyone please clarify me, why the atomic clock in a spaceship is taken as a reference while explaining a special theory of relativity?. I always wonder how 2 people one outside the spaceship and the other inside it feels about a time in 2 different manner. and this problem exists only when I carry an atomic clock inside a spaceship (for the reference of a time). If i carry an analog clock(run by a battery), both the people inside and outside the spaceship can see the same time right.?
 
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  • #2
No, it doesn't matter what kind of clock you use. In real-world experiments such as the Hafele-Keating experiment http://en.wikipedia.org/wiki/Hafele-Keating_experiment , they use atomic clocks because the relativistic effects are small, so you need a very accurate clock in order to detect them.

It's only because the effect is the same on all clocks that we can consider time dilation as an effect on time rather than an effect on the specific internal mechanisms of some type of clock.
 
  • #3
And it's not being inside or outside a spaceship that is the issue, it's one clock traveling at some speed in relation to another clock. We just like to put the people in the spaceships so that they can breathe and have a means of propulsion so that the clocks can get up to a speed difference between them. So sometimes we talk about people in two spaceships traveling and sometimes we talk about people in just one spaceship while the people outside remain on Earth where, of course, breathing is not a problem and where they have their own clock. Remember, two clocks are involved and when there is a speed difference between them, meaning they are either getting closer together or getting farther apart, then each will determine that the others clock is ticking slower than their own.
 
  • #4
Thanks a lot.. a lot... But my little brain thinks, ( analog clock ) the mechanism which moves the needle of a clock will always be same in all the frame of references. so the 2 guys one in spaceship and other stands outside must see the same needle movement of a clock. And why should a person assumes atomic clock is the accurate one.. Instead of thinking about time dilation and space contraction..etc, one can simply thinks the way we have understood what the light is might be wrong. Or one can simply think atomic clock is not accurate. right ?

I ll be eagerly waiting for your clarification sir. Thanks a lot again..
 
  • #5
Are you saying the analog clock is accurate while the atomic clock in the same circumstance is inaccurate?
 
  • #6
AnilML said:
But my little brain thinks, ( analog clock ) the mechanism which moves the needle of a clock will always be same in all the frame of references. so the 2 guys one in spaceship and other stands outside must see the same needle movement of a clock.

Your intuition is wrong. As bcrowell said, all clocks slow down because time itself slows down. This has been verified by many, many experiments.
 
  • #7
AnilML said:
( analog clock ) the mechanism which moves the needle of a clock will always be same in all the frame of references. so the 2 guys one in spaceship and other stands outside must see the same needle movement of a clock.

The mechanism that moves the needle is the same in all frames of reference - what's different is the speed at which all mechanisms, including that one, appear to operate when viewed from different frames of reference. Use a mechanical clock operated by a pendulum, and the moving observer will measure a different speed for the pendulum, and hence a different slower tick rate for the clock, than will the observer at rest relative to the pendulum.
 
  • #8
Nugatory said:
The mechanism that moves the needle is the same in all frames of reference - what's different is the speed at which all mechanisms, including that one, appear to operate when viewed from different frames of reference. Use a mechanical clock operated by a pendulum, and the moving observer will measure a different speed for the pendulum, and hence a different slower tick rate for the clock, than will the observer at rest relative to the pendulum.
Einstein said a balance clock is preferred. A pendulum clock is dependent on gravity and not good.
 
  • #9
Hello friends, I have small doubt here. what the time actually is ? in relativity experiments the differences found in measurements only, I feel the time is something other than physical quantity it has only positive direction, right? If we consider the time as a fourth dimension why it is not possible for us to go in negative direction? please clarify this , Thanks
 
  • #10
sunil83_nie said:
Hello friends, I have small doubt here. what the time actually is ? in relativity experiments the differences found in measurements only, I feel the time is something other than physical quantity it has only positive direction, right? If we consider the time as a fourth dimension why it is not possible for us to go in negative direction? please clarify this , Thanks
Spacetime is comprised of three space-like dimensions and one time-like dimension. One of the characteristics of time-like dimensions is that we can only move in one direction through it.
 

FAQ: Atomic clock used in spaceships

1. What is an atomic clock and how does it work?

An atomic clock is a highly accurate timekeeping device that uses the oscillation frequency of atoms as a measurement. These clocks use the oscillation of cesium atoms to keep time, as the frequency of these atoms is extremely stable and can be used to measure time with great precision.

2. Why are atomic clocks used in spaceships?

Atomic clocks are used in spaceships because they are highly accurate and can maintain precise timekeeping even in extreme conditions such as high speeds and changing gravitational forces. This is crucial for navigation and communication purposes during space travel.

3. How are atomic clocks calibrated and maintained in spaceships?

Atomic clocks used in spaceships are calibrated and maintained using a process called laser cooling and trapping. This involves using lasers to cool the atoms down to a near-absolute zero temperature, which allows for more precise measurements. The clocks also have built-in mechanisms to adjust for any potential drift in timekeeping.

4. Can atomic clocks be affected by radiation in space?

Yes, atomic clocks can be affected by radiation in space. However, they are designed to withstand and adjust for these effects. In fact, the precision and stability of atomic clocks make them more resistant to radiation compared to other timekeeping devices.

5. How do atomic clocks in spaceships synchronize with Earth-based timekeeping systems?

Atomic clocks in spaceships are typically synced with Earth-based timekeeping systems before launch. However, due to the effects of relativity, they may experience slight differences in timekeeping. To correct for this, signals from the clocks can be sent back to Earth for comparison and adjustment if needed.

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