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- One fundamental quantity which we have discussed earlier is length.
- One fundamental quantity which we have discussed earlier is length.
- To measure the length or distance the SI unit used is metre (m).
- To measure the length or distance the SI unit used is metre (m).
- In 1960, a standard for the metre based on the wavelength of orange-red light emitted by atoms of krypton was adopted.
- In 1960, a standard for the metre based on the wavelength of orange-red light emitted by atoms of krypton was adopted.
- By 1983 a more precise measurement was developed.
- By 1983 a more precise measurement was developed.
- It says that a metre is the length of the path travelled by light in vacuum during a time interval of 1/299792458 second.
- It says that a metre is the length of the path travelled by light in vacuum during a time interval of 1/299792458 second.
- This was possible as by that time the speed of light in vacuum could be measured precisely as
- This was possible as by that time the speed of light in vacuum could be measured precisely as
c = 299792458 m/s.
c = 299792458 m/s.
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