What is the speed of e.m. waves in vacuu...

What is the speed of e.m. waves in vacuum?

Text Solution

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`upsilon=3xx10^(8)m//s.`

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Knowledge Check

An electromagnetic wave , whose wave normal makes an angle of 45^(@) with the vertical , travelling in air strikes a horizontal liquid surface . While travelling through the liquid it gets deviated through 15^(@) . What is the speed of the e.m. wave in the liquid , if the speed of electromagnetic wave in air is 3xx 10^(8) m/s ?

A

`1.5 xx 10^(8)` m/s

B

`2.1 xx 10^(8) ` m/s

C

`2.5 xx 10^(8)` m/s

D

`(sqrt2)/(3) xx 10^(8)` m/s

The speed of electmagnetic waves in vacuum is equal to

A

`mu_(0)epsi_(0)`

B

`sqrt(mu_(0)epsi_(0))`

C

`(1)/(sqrt(mu_(0)epsi_(0)))`

D

`(1)/(mu_(0)epsi_(0))`

The speed of electromagnetic wave in vacuum

A

Increases as we move from `gamma`-rays to radio waves

B

Decreases as move from `gamma`-rays to radio waves

C

Is same for all of them

D

None of these

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