Example & Question: What Will Clock 3 Count?

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In summary, the conversation discusses the concept of time dilation and how it applies to a scenario involving a plane, a light source, and three clocks. In the diagrams provided, it is shown that in the frame of reference of the plane, the light will reach the third clock in 1 second, while in the frame of reference of the stationary clocks, the light will reach the third clock in 1.5 seconds. The conversation also mentions the importance of considering the speed of the light source and the clocks in the scenario.
  • #1
ghost11
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Hi guys
is the example true?
what will the clock 3 count when the light reach it

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  • #2
Welcome to PF! Move towards the light!

Hi ghost11! Welcome to PF! :smile:

Yes, the diagrams are correct …

the lamp and the clocks are stationary, and the plane is going half as fast as the light, so in the clocks' frame (middle diagram), the plane will reach the first clock at the same time as the light reaches the second clock.

And in the plane's frame (bottom diagram), a ray of light is moving left, and the clocks are moving right, half as fast as the light …

(and of course they're closer together, but that won't make any difference)

so when the first clock reaches the plane, the third clock will have moved towards the light.
ghost11 said:
what will the clock 3 count when the light reach it

You do the maths (no square-roots needed! :wink:) …

what equations do you get?

Hint: move towards the light, ghost11! :smile:​
 
  • #3
thank you tiny-tim
in the second and third diagram the clocks count 1 second!
in the second diagram it will take 1.5 second for the light to reach clock 3
in the third diagram it will take 1 second for the light to reach clock 3
what the clock will count for real??
please explane more ... cause iam little slow .. o:)
 
  • #4
Clock 3 will show 1.5s when the light reaches it. The third diagram is a bit confusing. It shouldn't say "clocks 1s". It should say that the clock on the plane shows 1s. Also, it shouldn't say that the plane's speed is c/2. It should say that the speed of the light bulb and the clocks in the picture is c/2.
 
  • #5
Fredrik thank you a lot
I didn't see it that way ... i understand now
 

FAQ: Example & Question: What Will Clock 3 Count?

What is a clock 3 count?

A clock 3 count refers to the number of times a clock strikes or chimes at the third hour of the day. For example, if a clock strikes 3 times at 3 o'clock, it would have a clock 3 count of 3.

How does a clock count the hours?

A clock counts the hours by using a mechanism called a movement, which includes gears and a pendulum or electronic oscillator. The movement is connected to the clock hands, causing them to move and indicate the hour on the clock face.

Can a clock 3 count vary?

Yes, a clock 3 count can vary depending on the type of clock and its accuracy. Mechanical clocks may have slight variations due to wear and tear, while digital clocks may have a more precise 3 count.

What is the significance of clock 3 count?

The significance of clock 3 count varies depending on cultural and personal beliefs. In some cultures, the third hour of the day may have special meaning or be associated with certain events. Some people also believe that hearing a clock strike 3 times at 3 o'clock is a sign of good luck.

How can a clock 3 count be adjusted?

A clock 3 count can be adjusted by adjusting the clock's movement or by manually moving the clock hands. However, it is important to follow the manufacturer's instructions and be careful when adjusting the clock to avoid damaging it.

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