Sub-atomic Particles

Which of the following is never true for cathode rays?

Protons are discovered by 

Find the total mass(in mg) of neutrons in $7 \mathrm{mg}$ of ${}^{14}\mathrm{C}$. (Assume the mass of a neutron$=$mass of a hydrogen atom)

Report your answer as the nearest integer.

In Millikan's experiment, static electric charge on the oil drops has been obtained by shining $\mathrm{X}$-rays. If the static electric charge on the oil drop is $-1.282\times {10}^{-18} \mathrm{C}$, calculate the number of electrons present on it.

_____ and neutron are found inside the nucleus.

An atom consists of proton, electron and _____ which are called sub-atomic particles.

Among the following, the correct statement about cathode ray discharge tube is

 

Cathode rays are:

Name the element whose isotope has mass number $14$ and $8$ neutrons.

An atom having atomic mass number $13$ has $7$ neutrons. What is the atomic number of the atom?

Which of the following will not show deflection from the path on passing through an electric field? (Proton, cathode rays, electron, neutron)

In Millikan's experiment, static electric charge on the oil drops has been obtained by shining X-rays. If the static electric charge on the oil drop is $-1.282\times {10}^{-18} \mathrm{C}$, calculate the number of electrons present on it.

Which of the following substances, shows the properties of phosphorescent?

The electrical discharge through the gases could be observed only at

The $\mathrm{e}/\mathrm{m}$ ratio is maximum for :-

Describe the experiment which led to the discovery of the proton.

Consider $\mathrm{\alpha }$ -particles, $\mathrm{\beta }$ -particles and $\mathrm{\gamma }$-rays, each having an energy of $0.50 \mathrm{MeV}.$ The increasing order of penetration power is:

The mass of cathode ray particle is:

The increasing order for the values of ${\mathrm{em}}^{-1}$ (charge/mass) is:

Cathode rays