Question

At a specific instant emission of a radioactive compound is deflected in a magnetic field. The compound cannot emit
$\left( a \right)$ Electron
$\left( b \right)$ Proton
$\left( c \right)$ $H{e^{2 + }}$
$\left( d \right)$ Neutrons

Answer 1

In the questions, various particles are given. We know that the magnetic field interacts with charged particles. And we also know that when there is emission from the radioactive element then the charge particles get deflected in the magnetic field and by using the above information, now we can observe the nature of particles.

Complete step by step answer: Electrons are the negatively charged subatomic particles which revolve around the nucleus in an atom. As they are negatively charged, they are deflected in a magnetic field hence the compound can emit an electron. For protons which are positively charged subatomic particles of an atom, deflection is observed in the magnetic field due to the presence of charge. $H{e^{2 + }}$ is also a positive charged ion. Hence, it can be emitted. Neutrons are the main constituent of a nuclei. They have no electrical charge. So, they cannot be deflected in a magnetic field.
The compound cannot emit is neutrons.

The correct option is $\left( d \right)$.

Additional information: Radioactive compounds are those who spontaneously emit large numbers of rays. This phenomenon is called radioactivity. This occurs mainly due to nuclear instability. There are three types of rays due to radioactive radiation namely alpha, beta and gamma rays. Alpha rays are the ones which are positively charged and show small deflection in electric and magnetic fields. Beta rays are negatively charged and are lighter than alpha particles hence show more deflection than alpha particles. Gamma rays have no charge and are not deflected in by magnetic or electric fields.

Note: $H{e^{2 + }}$is a helium ion which has two positive charges which means it has lost two electrons and so there are no electrons present and is left with a positive charge equal to two electron charges. These doubly ionized helium atoms are the Alpha particles.