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Q 01 / 25
The charge on an electron is \(-1.602\times10^{-19}\,\text{C}\).
Q 02 / 25
Cathode rays consist of positively charged particles.
Q 03 / 25
The mass of a proton is approximately equal to that of a neutron.
Q 04 / 25
The radius of an atom is of the order \(10^{-10}\,\text{m}\).
Q 05 / 25
In Rutherford’s model, electrons remain stationary around the nucleus.
Q 06 / 25
Isotopes have the same mass number but different atomic numbers.
Q 07 / 25
The atomic number represents the number of neutrons in a neutral atom.
Q 08 / 25
The frequency of radiation is inversely proportional to its wavelength: \( \nu=\frac{c}{\lambda} \).
Q 09 / 25
Line spectra arise due to electronic transitions between discrete energy levels.
Q 10 / 25
The photoelectric effect supports the wave nature of light.
Q 11 / 25
According to Bohr, angular momentum of electron is quantized as \(mvr=\frac{nh}{2\pi}\).
Q 12 / 25
The ground state of hydrogen corresponds to \(n=0\).
Q 13 / 25
The energy of an electron in hydrogen is given by \(E_n=-\frac{13.6}{n^2}\,\text{eV}\).
Q 14 / 25
Heisenberg uncertainty principle allows exact position and momentum simultaneously.
Q 15 / 25
Orbit and orbital represent the same physical concept.
Q 16 / 25
The shape of a \(p\)-orbital is spherical.
Q 17 / 25
For a given \(n\), total orbitals equal \(n^2\).
Q 18 / 25
The maximum number of electrons in a shell is \(2n^2\).
Q 19 / 25
The de Broglie wavelength of a particle decreases with increasing momentum.
Q 20 / 25
In multi-electron atoms, orbital energies depend only on \(n\).
Q 21 / 25
The order of orbital filling follows the \(n+l\) rule.
Q 22 / 25
A node is a region where probability density of finding electron is zero.
Q 23 / 25
The number of radial nodes equals \(n-l-1\).
Q 24 / 25
The shortest wavelength in X-ray spectra corresponds to complete loss of kinetic energy of electrons.
Q 25 / 25
If velocity of an electron doubles, its de Broglie wavelength becomes half.
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