Question

True or False(5 marks)
2. All the clocks make use of some periodic motion.
3. The basic unit of speed is km/h.
4.The basic unit of time is second.
5. Age of a person is expressed in days.​

Answer 1

Answer:@PRANJAL

Explanation:

 OK

2) TRUE

3)TRUE

4)true

5)nope(years)

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Answer 2

Answer:

1- The working principle of all clocks is same i.e. periodic motion. A sundial measures the periodic position of shadow on a dial. A pendulum clock measures number of oscillations of the bob.

2- The unit of distance is the metre (m) and of time is second(s). Therefore the basic unit of speed is m/s.

3-Second, fundamental unit of time, now defined in terms of the radiation frequency at which atoms of the element cesium change from one state to another. The second was formerly defined as 1/86,400 of the mean solar day—i.e., the average period of rotation of the Earth on its axis relative to the Sun.

4- false

Explanation:

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