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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3as109

The electron in hydrogen moves from the $n = 2$ orbit to the $n = 4$ orbit. Select the correct statements.

AThe time period becomes 4 times larger
BThe orbit radius becomes 4 times larger
CThe angular momentum becomes twice as large
DThe speed becomes half

Answer: B, C, D

r \propto n^{2}

:

(4/2)^{2} = 4

.

v \propto 1/ n

: half.

T \propto n^{3}

:

(4/2)^{3} = 8

, so 'four times' is wrong.

L = nh /2 π

doubles.

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