Mass Energy Equivalence

Q. 31. SF4 and SF6 exist as a stable molecules while oF4 and oF6 do not, why?

Q. energy of h2 atom in ground state is -13.6eV energy of he2+ ion in second excited state is nearly

Q. If $E_n$ is the energy of electron in nth orbit for hydrogen like species, then which is the correct relationship ?

1. $E_{1}ofH=\frac{1}{2}{E}_{2}ofH{e}^{+}=\frac{1}{3}{E}_{3}ofL{i}^{2+}=\frac{1}{4}{E}_{4}ofB{e}^{3+}$
2. $E_1\left(H\right)=E_2\left(H{e}^{+}\right)=E_3\left(L{i}^{2+}\right)=E_4\left(B{e}^{3+}\right)$
3. No relation
4. $E_1\left(H\right)=2E_2\left(H{e}^{+}\right)=3E_3\left(L{e}^{2+}\right)=4E_4\left(B{e}^{3+}\right)$

Q. In a nuclear fusion, the masses of the fusing nuclei are $m_1$ and $m_2$. The mass of the fused nuclei $m$, would have the realtion: $m$$m_1$ $m_2$

1. =
2. <
3. >
4. +

Q. Find the ratio pf ratio of radius, velocity, energy for n=2 of li^+2 to n=3 of he^+ ion?

Q. The electron in a hydrogen atom is in the first orbit (n=1). Calculate the energy required to convert H to H⁺ ion. (Hint: calculate the energy required to ionize hydrogen atom). Also calculate the energy required for if we consider a mole of hydrogen atoms. ​

Q. The first, second and third ionisation energies of Alare 578, 1817 and 2745 kJ mol-1 respectively.Calculate the energy required to convert all the atomsof Al to Al+3 present in 270 mg of Al vapours(1) 5140 kJ(2) 51.40 kJ(3) 2745 kJ(4) 514.0 kJ

Q. the energy of hydrogen atom in ground state is -13.6eV.its energy correspondent to the quantum number n=5 is

Q. If I completely annihilate a hair of your body that has a mass of $1\mu g$ then how much energy will I get in the process.

1. $9\times {10}^{10}J$
2. $8\times {10}^{10}J$
3. $9\times {10}^{12}J$
4. $8\times {10}^{6}J$

Q.

1st and 2nd ionization energies of magnesium are 7.645 and 15.035 eV respectively. The amount of energy in kJ needed to convert all the atoms of magnesium into Mg²⁺ ions present in 12 mg of magnesium vapours in

Q.

calculate the energy and frequency of light required to excite an electron in hydrogen atom from first energy level to fourth energy level

Q. Similar to electron diffraction, neutron diffraction microscope is also used for the determination of the structure of molecules. If the wavelength used here is 800 pm, calculate the characteristic velocity associated with the neutron.

Q. the quantized energy of an electron in hydrogen atom for the nth energy level is given by En= -1.312/n²*10⁶ J per mol . calculate the energy required to remove the electron completely from an excited hydrogen atom when its quantized level = 3