When `Z` is doubled in an atom, which of the following statements are consistent with Bohr's theory ?

Options

A. Energy of a state is doubled
B. Radius of an orbit is doubled
C. Velocity of electron in an orbit is doubled
D. Energy of a state is halved.

Answer

C

Explanation

( c) `E_n prop Z^2` `:. Z "doubled" rArr E_n` becomes four times.
`R_n prop 1//Z` `:. Z "doubled" rArr R_n` becomes half.
`v_(n) prop Z` :. `Z "doubled" rArr v_n` becomes two times.