Advertisements
Advertisements
प्रश्न
The mass number of a nucleus is
विकल्प
always less than its atomic number
always more than its atomic number
equal to its atomic number
sometimes more than and sometimes equal to its atomic number.
Advertisements
उत्तर
sometimes more than and sometimes equal to its atomic number
Mass number of a nucleus is defined as the sum of the number of neutron and protons present in the nucleus, i.e. the number of nucleons in the nucleus, whereas atomic number is equal to the number of protons present. Therefore, the atomic number is smaller than the mass number. But in the nucleus (like that of hydrogen 1H1), only protons are present. Due to this, the mass number is equal to the atomic number.
APPEARS IN
संबंधित प्रश्न
In the study of Geiger-Marsdon experiment on scattering of α particles by a thin foil of gold, draw the trajectory of α-particles in the coulomb field of target nucleus. Explain briefly how one gets the information on the size of the nucleus from this study.
From the relation R = R0 A1/3, where R0 is constant and A is the mass number of the nucleus, show that nuclear matter density is independent of A
Find the Q-value and the kinetic energy of the emitted α-particle in the α-decay of `""_88^226 "Ra"`.
Given `"m"(""_88^226"Ra")` = 226.02540 u, `"m"(""_86^222 "Rn")` = 222.01750 u,
`"m"(""_86^220 "Rn")`= 220.01137 u, `"m"(""_84^216 "Po")`= 216.00189 u.
What do you mean by polar molecules and non-polar molecules? Give ‘one’ example each.
Name a material which is used in making control rods in a nuclear reactor.
Write one balanced equation to show Emission of `beta^-` (i.e. a negative beta particle)
Atomic mass unit (u) is defined as ________ of the mass of the carbon (12C) atom.
The nuclei of isotopes of a given element contain the same number of ______.
Nuclides with same neutron number N but different atomic number Z are called ______.
Two cars of mass m1 and m2 are moving in circles of radii r1 and r2, respectively. Their speeds are such that they make complete circles at the same time t. The ratio of their centripetal acceleration is:
Distinguish between isotopes and isobars.
Two nuclei may have the same radius, even though they contain different numbers of protons and neutrons. Explain.
Mass numbers of two nuclei are in the ratio of 4 : 3. Their nuclear densities will be in the ratio of ______.
Which of the following are the constituents of the nucleus?
What conclusion is drawn from Rutherford’s scattering experiment of α-particles?
The density of nuclear matter is:
Energy equivalent of 1 amu is:
Accurate measurement of atomic masses is carried out with a:
The value of one atomic mass unit (1 u) is:
A new type of neutral particle whose mass is very nearly the same as that of a proton is called a:
A proton or a neutron is collectively called a:
