Which of these are radioactive elements?

Cosmic rays

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Uranium-238

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Carbon-40

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Thorium

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Carbon-14

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Solution

The correct options are
B Uranium-238
C Carbon-40
D Thorium
E Carbon-14
Radioactive elements like uranium (U-238), thorium, radium, isotopes of potassium (K-40) and carbon (C-14) are naturally occurring sources of radioactivity. Cosmic rays originating from the sun are also a source of radioactivity, but are not among the correct options as they are not elements.

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