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Solution


Q.

Select the correct statements among the following:
A. Slow neutrons can cause fission in U92235 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:                       [2024]
1 A, B and C only  
2 A, B and D only  
3 A and B only  
4 C and D only  

Ans.

(1)

Slow neutrons spend more time close to U92235 while passing as compared to fast neutrons.

α-rays are helium nuclei H24.

β-rays are fast moving electrons or positrons.

γ-rays are electromagnetic radiations of wavelength smaller than X-rays.

So, statements A, B and C are correct.