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Which of the following is the smallest unit of length?

nanometer

yoctometre

picometre

femtometre

Yocto is a unit prefix in the metric system denoting a factor of 10−24 or 0.000000000000000000000001. It was adopted in 1991 by the General Conference on Weights and Measures. It comes from the Latin/Greek octo (οκτώ), meaning "eight", because it is equal to 1000−8. Yocto- is the smallest official SI prefix.

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3

UCL Mathematical & Physical Sciences wikipedia → Yocto-

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Answers by country

the Netherlands

0%

91%

0%

8%

12

Australia

20%

58%

12%

8%

24

India

17%

50%

15%

16%

114

Greece

42%

50%

7%

0%

14

the United States

20%

41%

18%

18%

58

Poland

26%

32%

23%

18%

1465

Germany

21%

32%

21%

23%

91

Austria

45%

29%

8%

16%

24

the United Kingdom

42%

21%

18%

18%

38

Nigeria

17%

17%

41%

23%

17

Pakistan

70%

10%

10%

10%

10

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