Question

Assertion: β−particles are deflected more than α−particles in a given electric field.
Reason: Charge on α−particles is larger than on β−particles.
A.If both (A) and (R) are correct, and (R) is the correct explanation of (A).
B.If both (A) and (R) are correct, but (R) is not the correct explanation of (A).
C.If (A) is correct, but (R) is incorrect.
D.If (A) is incorrect, but (R) is correct.
E.If both (A) and (R) are incorrect

Answer 1

Hint: α- particles: They are the particles having two protons and two neutrons bound together and are produced during alpha decay of the radioactive material.
β-particles: They are the high speed positrons are electrons particles resulting from the beta decay of the radioactive.

Complete step by step answer:
The Alpha particle is the nucleus of helium; i.e. it consists of two protons and two neutrons and its atomic structure. Atom of helium contains no electrons to balance the two positively charged protons in its structure. Therefore the charge on Alpha particles is positive and therefore is known as positively charged particles moving at high speeds and are attracted towards the negatively charged plate.
On the other hand β-particles are high energy electrons and have negative charge on them. They are fast-moving electrons due to their very low mass and high charge to mass density. The deflection shown by β-particles is much more as compared to heavier alpha particles due to this charge to mass density.
Thus the correct option is B i.e. Both both (A) and (R) are correct, but (R) is not the correct explanation of (A).
Note:
Alpha and beta particles are the result of Radioactive disintegration as shown by the radioactive materials of the periodic table, and these radioactive materials can be used as alternative forms of energy.