Question

15. Why'metre' has been defined in terms of wavelength and 'second' in terms of periods of radiation or rotation?​

Answer 1

Answer:

here is your answer

Explanation:

Metre is well defined in terms of wavelength and time in terms of periods of radiation why? ... The standard metre has been so defined because Kr-86 isotope can be obtained relatively easily and cheaply in rather pure form. So the standard is easily reproducible.

Answer 2

Answer:

Metre is well defined in terms of wavelength and time in terms of periods of radiation why? ... The standard metre has been so defined because Kr-86 isotope can be obtained relatively easily and cheaply in rather pure form. So the standard is easily reproducible.