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JEE CHEMISTRY MCQ: STRUCTURE OF ATOM

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Which of the following is never true for cathode rays?

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Correct option: B

They are electromagnetic waves.

Option B (They are electromagnetic waves) is correct because cathode rays are streams of electrons, not electromagnetic waves.

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Which of the following is paramagnetic? The time taken by the electron in one complete revolution in the

n^{\text {th }}

Bohr's orbit of the hydrogen atom is The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency '

\mathrm{A}

\times 10^{12}

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\frac{1}{{ }^{\prime} \mathrm{B}^{\prime}}

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\ell = 1,\,\,m = 0

in magnesium atom is The nucleus and an atom can be assumed to be spherical. The radius of the nucleus of mass no. A is given by

1.25 \times {10^{ - 13}} \times {A^{1/3}}\mathrm{cm}.

. The atomic radius of atom is 1 Å. If the mass no. is 64, the fraction of the atomic volume that is occupied by nucleus is: