Question

Select the correct statements among the following:
A. Slow neutrons can cause fission in \( \frac{235}{92}U \) more effectively than fast neutrons.
B. \( \alpha \)-rays are Helium nuclei.
C. \( \beta \)-rays are fast moving electrons or positrons.
D. \( \gamma \)-rays are electromagnetic radiations with wavelengths larger than X-rays.
Choose the 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 1

The Correct Option is A

Let's evaluate each statement:

A. Slow neutrons are more effective in causing nuclear fission in $^{235}_{92}$U than fast neutrons because they have a higher probability of interaction with the uranium nucleus. This statement is correct.

B. α-rays consist of two protons and two neutrons; they are identical to Helium nuclei. This statement is correct.

C. β-rays are high-speed electrons − or positrons⁺ emitted during radioactive decay. This statement is correct.

D. γ-rays are electromagnetic radiation with wavelengths shorter than X-rays. This statement is incorrect.

Therefore, statements A, B, and C are correct.