Define time. Mention its SI unit . How the time was measured in ancient times?
Answers
Answer:
Time is defined as the duration in which all things happen, or a precise instant that something happens.
In physics time means the duration taken by a body to complete a given task
SI unit: Second(s)
In ancient time people used instruments such as Sundial ,Water clock ,etc.
Answer:
Explanation:
Defanition of time:
the measured or measurable period during which an action, process, or condition exists or continues
SI unit:
Second, It is defined as the duration of 9,192,631,770 periods of radiation corresponding to the transition between the two hyperfine levels of the ground state of Cesium-133 atom
One of the earliest of all devices to tell time was the sundial. The sundial is looked on as being a form of sun-powered clock. ... There was another more advanced shadow clock or sundial in use by the ancient Egyptians around 1500 BC. This shadow clock or sundial permitted one to measure the passage of hours within a day