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Phases of the moon

What is the a...

Question

What is the advantage of choosing the wavelength of light as a standard of length?

Travels fast

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Speed independent of location and temperature

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No medium to travel

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No advantage

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Solution

The correct option is C Speed independent of location and temperature
Advantage :
1) It is easy available and invariable
2) It is well defined and does not change with locations, temperature, time, pressure etc

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What is the change ln wavelength & velocity when light travells phically rarer to denser medium?

500 n m

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