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Which of the following radiations has the least wavelength?

1. $\gamma$-rays
2. $\beta$-rays
3. $\alpha$-rays
4. X-rays

Correct answer: $\gamma$-rays

Solution

Among the given options, gamma rays have the highest frequency and therefore the least wavelength. Alpha and beta rays are not electromagnetic radiations, while X-rays have longer wavelength than gamma rays.

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