The proper time between two events is measured by a clock at rest in a reference frame in which the two events:
Correct answer: B. Occur at the same co-ordinates
- A. Occurs at the same time
- B. Occur at the same co-ordinates
- C. Are separated by the distance a light signal can travel during the time interval
- D. Satisfy none of the above
Explanation
The proper time interval between two events is the amount of elapsed time reckoned on the clock of an observer in an inertial frame of reference who is physically present at both events. So if the observer needs to be present at both events, they must take place at the same coordinates.
This question appeared on the ETEA MDCAT 2015 paper, which you can sit online with every answer explained.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Quantum Theory and Radiation
Quantum theory treats electromagnetic radiation as packets of energy called photons, with energy proportional to frequency through E equals hf. The topic covers Planck's hypothesis, photon momentum, the photoelectric effect, threshold frequency, work function and wave particle duality, distinguishing quantised energy exchange from classical continuous radiation.
Practise Dawn of Modern Physics
739 free Dawn of Modern Physics MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 16 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Quantum Theory and Radiation questions
The wave nature of electrons is suggested by experiments on
Which of the following is the best evidence for the wave nature of matter?
The de-Broglie wavelength of a rifle bullet of mass 0.02kg which is moving at a speed of 300ms-1 is (where h = 6.63×10 -34 Js)
If 50 KV is the applied potential in ax X-ray tube then the minimum wavelength of X-rays produced is:
In Einstein's universe what is the fourth dimension:
An electron has charge (e) and mass (m). A proton has charge e and mass 1840m. A "Proton volt" is equal to: