Fission of nuclei is possible because the binding energy per nucleon in them
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(a) increases with mass number at low mass numbers (b) decreases with mass number at low mass numbers (c) […]
In the reaction ₁²H+₁³H+₂⁴He+₀¹n, if the binding energies of ₁²H,₁³H and ₂⁴He are respectively a,b and c (in MeV), then the energy (in MeV) released in this reaction is
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(a) a+b+c (b) […]
The Bohr model of atoms
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(a) Assumes that the angular momentum of electrons is quantized (b) Uses Einstein’s photoelectric equation (c) Predicts emission spectra for continuous atoms (d) Predicts the same emission […]
If in a nuclear fusion process, the masses of the fusing nuclei be m₁ and m₂ and the mass of the resultant nucleus be m₃, then
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(a) m₃=m₁+m₂ (b) m₃=(m₁-m₂) (c) m₃<(m₁+m₂) (d) […]
Complete the reaction: ₀n¹+ ₉₂U²³⁵→₅₆Ba¹⁴⁴+……..+3n
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(a) ₃₆Kr⁸⁹ (b) ₃₆Kr⁹⁰ (c) ₃₆Kr⁹³ (d) ₃₆Kr⁹²
Correct Answer:
₃₆Kr⁸⁹
Explanation:
A’ of product of be formed = (235 + 1) – (144 +3) = 236 – […]
If the ionisation energy for the hydrogen atom is 13.6 eV, the energy required to excite it from the ground state to the next higher state is nearly
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(a) 3.4 eV (b) […]
What is the Q-value of the reaction? ¹H+⁷Li → ⁴He+⁴He The atomic masses of ¹H,⁴He and ⁷Li are 1.0078254u, 4.0026034u and 7.016004u, respectively.
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(a) 17.35 MeV (b) 18.06 MeV (c) 177.35 MeV […]
If the binding energy of the electron in a hydrogen atom is 13.6 eV, the energy required to remove the electron from the first excited state of Li⁺⁺ is
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(a) 122.4 eV […]
If 10000 V is applied across an X-ray tube, what will be the ratio of de-Broglie wavelength of the incident electrons to the shortest wavelength X-ray produced? (e/m for electron =1.8×10¹¹ C kg⁻¹)
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When the wave of hydrogen atom comes from infinity into the first orbit, the value of wave number is
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(a) 109700 cm⁻¹ (b) 1097 cm⁻¹ (c) 109 cm⁻¹ (d) None of these
Correct […]
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