Select the correct statements among the following: A. Slow neutrons can cause fission in ²³⁵₉₂U than fast neutrons. B. α -rays are Helium nuclei. C. β -rays are fast moving electrons or positrons. D. γ -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

Answer: (a). A: true, slow (thermal) neutrons cause fission of ²³⁵U more readily than fast ones. B: true, α -rays are helium nuclei. C: true, β -rays are fast electrons ( β⁻) or positrons ( β⁺). D: false, γ -rays have wavelengths shorter than X-rays. So the answer is (a) A, B and C only.

Select the correct statements among the following: A. Slow neutrons… | NEET 2024

Q7NEET 2024Easy

Radioactive Decays: Alpha, Beta, Gamma

Select the correct statements among the following:

A. Slow neutrons can cause fission in ${}^{235}_{92}\text{U}$ 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 $\text{X}$ -rays.

Choose the most appropriate answer from the options given below:

Show answer and solution

Answer: (a)

A: true, slow (thermal) neutrons cause fission of ${}^{235}\text{U}$ more readily than fast ones.
B: true, $\alpha$ -rays are helium nuclei.
C: true, $\beta$ -rays are fast electrons ( $\beta^-$ ) or positrons ( $\beta^+$ ).
D: false, $\gamma$ -rays have wavelengths shorter than X-rays.
So the answer is (a) A, B and C only.

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