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A dimensionless quantity...

A dimensionless quantity

A

relative velocity

B

refractive index

C

density

D

momentum

Text Solution

Verified by Experts

The correct Answer is:
B
As `E=lambda/(2pi in_(0)r)`
so `V=lambda/(2pi in_(0))l_(n)r rArr W=lambda/(2pi in_(0))ln|r_(2)/r_(1)|`
`W=lambda/(2pi in_(0))ln (sqrt(2)/sqrt(1))+(2lambda)/(2pi in_(0))ln (sqrt(2)/sqrt(2))`
`=lambda/(2pi in_(0))ln2`
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