Question 2 :
Oxygen consists of isotopes ${{\text{O}}^{16}}\,$,${{\text{O}}^{17}}\,$ and ${{\text{O}}^{18}}\,$ carbon consists of isotopes of ${{\text{C}}^{{\text{12}}}}$ and ${{\text{C}}^{{\text{13}}}}$ Total number of ${\text{C}}{{\text{O}}_2}$ molecules possible are
Question 3 :
The cathode rays tube experiments carried out by J.J. Thomson demonstrated that :
Question 5 :
Proton is formed by the loss of electron from which atom/ion?
Question 6 :
Who said that cathode rays consist of negatively charged particles ?
Question 7 :
During the transformation of $_{ c }^{ a }{ X }$ to $_{ d }^{ b }{ Y }$, the number of $\beta $-particles emitted are
Question 8 :
Which of the following is true for mass and charge of electron?
Question 10 :
Almost the entire mass of an atom is concentrated in the :<br/>
Question 11 :
State whether the given statement is true or false:<br/>Nucleons are particles present in the nucleus of an atom.
Question 12 :
The mass of proton is_____  times the mass of an electron.
Question 13 :
By changing the metal electrodes and gas inside the cathode ray tube,
Question 14 :
In which of the following transformations, the $\beta $-particles are emitted?
Question 26 :
Assertion: The characteristics of cathode rays do not depend upon the material of electrodes and the nature of the gas present in the cathode ray tube.
Reason: Cathode rays consist of negatively charged particles, called electrons.
Question 27 :
Assertion: e/m ratio in case of anode ray experiment is different for different gases.
Reason: The ion of gases formed after the ejection of electron are different if gas is different.
Question 29 :
The oil drop experiment by R.A. Mulliken was performed to find :
Question 30 :
If the mass of electron is doubled, the speed of electron revolving around $Li^{2+}$ nucleus will ________