Which of the following statement(s) is/are correct? (a) The ratio of the radii of the first thre...

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Which of the following statement(s) is/are correct?
(a) The ratio of the radii of the first three Bohr orbits of hydrogen atom is \( 1: 8: 27 \).
(b) The ratio of magnitude of total energy: kinetic energy: potential energy for electron in any orbit of hydrogen atom is \( 1: 1: 2 \).
(c) The frequency of a green light is \( 6 \times 10^{14} \mathrm{~Hz} \), then its wavelength is \( 500 \mathrm{~nm} \).
(d) The ratio of de Broglie wavelength of a \( \mathrm{H} \)-atom, Heatom and \( \mathrm{CH}_{4} \)-molecule moving with equal kinetic energy is \( 4: 2: 1 \).
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