Select the correct statements among the following : A. Slow neutrons can cause fission in ${ }_{92}^{235}…
Select the correct statements among the following :
A. Slow neutrons can cause fission in ${ }_{92}^{235} \mathrm{U}$ than fast neutrons.
B. $\alpha$-rays are Helium nuclei.
C. $\beta$-rays are fast moving electrons or positrons.|
D. $\gamma$-rays are electromagnetic radiations of wavelengths larger than X-rays.
Choose the most appropriate answer from the options given below
A, B and C only
A, B and D only
A and B only
C and D only
Solution
(A) Slow neutron can cause fission in ${ }_{92}^{235} \mathrm{U}$ than fast neutrons because fast neutrons are too quick so they scatter of atoms instead of being captured by them
(B) $\alpha$-rays are Helium nuclei, is a true statement
(C) $\beta$-rays are generated when neutron is converted into proton by releasing electron or proton is converted into neutron by releasing positron.
(D) $\gamma$-rays have higher energies as compared to X -rays. So they have smaller wavelength as compared to X-rays.