One Gray is equal to how many joules per kilogram?

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Multiple Choice

One Gray is equal to how many joules per kilogram?

Explanation:
Gray is the absorbed dose: energy deposited per unit mass. By definition, 1 Gray equals 1 joule of energy deposited in 1 kilogram of matter, so one joule per kilogram is the correct equivalence. The other options don’t fit: 100 joules per kilogram would be 100 Gy, which is far larger; 1 joule per gram equals 1000 joules per kilogram, not 1 Gy; and 0.001 joule per kilogram is only 0.001 Gy.

Gray is the absorbed dose: energy deposited per unit mass. By definition, 1 Gray equals 1 joule of energy deposited in 1 kilogram of matter, so one joule per kilogram is the correct equivalence. The other options don’t fit: 100 joules per kilogram would be 100 Gy, which is far larger; 1 joule per gram equals 1000 joules per kilogram, not 1 Gy; and 0.001 joule per kilogram is only 0.001 Gy.

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