We might, of course, content ourselves with time values determined by an observer stationed together with the watch at the origin of the co-ordinates, and coordinating the corresponding positions of the hands with light signals, given out by every event to be timed, and reaching him through empty space. But this co-ordination has the disadvantage that it is not independent of the standpoint of the observer with the watch or clock, as we know from experience.
ghwellsjr said:It's because, although we can measure the round-trip speed of light, we cannot know if the two halves of the trip take an equal amount of time. In other words, we cannot measure the one-way speed of light without making some arbitrary assumptions (like, it is the same as the average of the two-way speed of light). The observers that Einstein is taliking about are moving at different constant speeds with respect to each other. Einstein's second postulate is that for each of them, they can make the assumption that the two halves of their measured round-trip will take the same amount of time and it will be consistent with the First Postulate that all the laws of physics look the same to all observers no matter what constant speed they are traveling at.
Discrepancy regarding time measurement refers to a difference or inconsistency between the actual time and the measured time. It can occur due to various factors such as human error, equipment malfunction, or environmental conditions.
Discrepancy in time measurement can significantly impact the accuracy and reliability of scientific experiments. It can lead to erroneous data and false conclusions, making it crucial for scientists to ensure precise and consistent time measurements.
Some common methods for measuring time in scientific experiments include using timers, stopwatches, clocks, and specialized equipment such as oscilloscopes or atomic clocks. Each method has its own level of accuracy and precision, and it is important to select the most appropriate one for a specific experiment.
To reduce discrepancies in time measurement, scientists can use multiple methods for measuring time, cross-check their results, and calibrate their equipment regularly. They can also take into account potential sources of error and make necessary adjustments to minimize discrepancies.
Accurate time measurement is crucial in scientific research as it allows for reliable and reproducible results. It also helps in establishing cause-and-effect relationships and making precise predictions. Without accurate time measurement, the validity and credibility of scientific findings can be called into question.