미터 원기

What was the primary issue with measurement units in France around 1789?

• Lack of any measurement units.

• Too many different and inconsistent measurement units.

• Units were too complex for common people to understand.

• Measurement units were only used by the wealthy.

How was the initial standard for the meter proposed by the French Academy of Sciences?

• Based on the average height of a French person.

• Defined as the length of a specific platinum bar.

• One ten-millionth of the distance from the North Pole to the Equator.

• The distance a horse could travel in one hour.

미터 원기의 문제점은 ㅇㅇ에 따라 길이가 수축 또는 팽창한다는 것이다.

(a)  

What was the main problem discovered with the platinum meter bar that led to a new definition of the meter?

• It was too expensive to produce.

• It was easily damaged and difficult to transport.

• Its length changed slightly due to temperature fluctuations.

• It was not universally accepted by all countries.

How is one second currently defined?

• The time it takes for light to travel a specific distance in a vacuum.

• The time it takes for a Cesium atom to oscillate a specific number of times.

• One 86,400th of a mean solar day.

• The time it takes for a pendulum to swing once.