The current definition of the standard meter of length is based on A) the distan

Question

The current definition of the standard meter of length is based on A) the distance between the earth's equator and north pole. B) the distance between the earth and the sun. C) the distance traveled by light in a vacuum. D) the length of a particular object kept in France. The current definition of the standard second of time is based on A) the frequency of radiation emitted by cesium atoms. B) the earth's rotation rate. C) the duration of one year. D) the oscillation of a particular pendulum kept in France.

Explanation / Answer

1)

The definition of meter is the length of the path travelled by light in vacuum during a time interval of 1/299 792 458 of a second

so the answer of 1 is (C)

2)

The second is the duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium 133 atom.

so answer is (A)

The definition of meter is the length of the path travelled by light in vacuum during a time interval of 1/299 792 458 of a second

so the answer of 1 is (C)

2)

The second is the duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium 133 atom.

so answer is (A)

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