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In terms of Rydberg constant R, the wave...

In terms of Rydberg constant R, the wave number of the first Balmer line is

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We know that `v=Romega`
For point `A:v_(A)=Romega_(0)` in the direction tangent to the right.
For point `B:v_(B)=Romega_(0)` in the direction tangent to the left.
For point `C:v_(C)=((R )/(2))omega_(0)` in the direction same as that of `v_(A)`
The disc is placed on a frictionless table, it will not roll. This is because the presence of friction is essential for the rolling of a body.
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