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Select the correct statements among the following: A. Slow neutrons can cause fission in $^{235}_{92}U$ 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
A, B and C only
B
A, B and D only
C
A and B only
D
C and D only
Detailed Solution
Slow neutrons cause fission in $^{235}_{92}U$ more effectively than fast neutrons (A is correct). $\alpha$-rays are Helium nuclei (B is correct). $\beta$-rays are fast-moving electrons/positrons generated in beta decay (C is correct). $\gamma$-rays have smaller (not larger) wavelength than X-rays, so D is incorrect. Hence A, B and C only.