Subatomic Particles

Q. The energy (ineV) possessed by a neon atom at 27C is 1) 1.72* 10-3 2)4.75*10-4 3)3.88*10-2 4)3.27*10-5

Q. An element having atomic mass 63.1g /mol has FCC unit cell with edge length 3.60810 to the power of -8cm . Calculate the density of unit cell?? (Given:Na = 6.02210 to the power 23 atoms / mol).

Q. Find the energy of H Atom in first excitation state. The value of premitivity factor 4pi epsilon Not Is given as 1.11264 10*-10 C* 2 N*-1 m*-2

Q.

If a Hydrogen nucleus is completely converted into energy, the energy produced will be around?

1. 1 MeV

2. 931 MeV

3. 9.38 MeV

4. 238 MeV

Q.

${}_{86}{}^{222}\mathrm{Rn}$ is an isotope of the noble gas radon.

What will be the atomic number of another isotope of radon?

Q. If we completely annihilate a hair of your body that has a mass of $1\mathrm{\mu g}$, how much energy will we get in the process?

1. $8\times {10}^{10}\text{J}$
2. $8\times {10}^7\text{J}$
3. $9\times {10}^{10}\text{J}$
4. $9\times {10}^7\text{J}$

Q. Find the average magnitude of linear momentum of a helium molecule in a sample of helium gas at 0°C. Mass of a helium molecule = 6.64 × 10⁻²⁷ kg and Boltzmann constant = 1.38 × 10⁻²³ J K⁻¹.

Q. the weight of one atom of uranium is 238 then what is it actual weight?

Q.

On February 27, 1932 James Chadwick published his conclusive findings about the elusive neutron. Below is a representation of the experimental setup he used. What are the missing parts of the puzzle?

1. i) alpha, ii) proton, iii) neutron

2. i) neutron, ii) alpha, iii) proton

3. i) proton, ii) neutron, iii) alpha

4. i) alpha, ii) neutron, iii) proton

Q. Matching pairs in the two lists given below are
List-I List-II
A) Gravitions E) Hyperons
B) Baryons F) Positrons
C) Pions G) Particles with zero mass nd with a spin of unity
D) Leptons H) Decay to -mesons
I) Massless particles with a probable spin of two units

1. A-E, B-H, C-G, D-I
2. A-I, B-E, C-H, D-F
3. A-H, B-F, C-I, D-E
4. A-F, B-G, C-E, D-H

Q.

Isotopes of an element differ in number of neutrons present in the nucleus.

1. True

2. False

Q. An energy of 24.6eV is required to remove one of the electrons from a neutral helium atom. The energy in (eV) required to remove both he electrons from a neutral helium atom is-

1. 38.2
2. 49.2
3. 51.8
4. 79.0

Q.

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

Q.

Two lithium nuclei at room temperature do not combine to form a carbon nucleus, because:

1. A lithium nucleus is more tightly bound than a carbon nucleus.

2. Carbon nucleus is an unstable particle.

3. It is not energetically favorable.

4. Coulomb repulsion does not allow the nuclei to come very close.

Q. What is the approximate energy equivalent (in MeV) to mass of a proton?