Why can't a vector be divided by a vector?

Vectors possess both magnitude as well as direction. Since you cannot divide direction with another direction, vectors cannot be divided.

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If a hydrogen atom is supplied with 15.8 eV ...

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What is ortho effect?

Relation between KE &n in Bohr atom mode...

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Solve 21.

Solve question 18 with necessary steps.

Please give solution .