Question

Einstein won ____Nobel prize in physics in 1921​
(a) a
(b)the

Answer 1

Einstein won the Nobel Prize in physics in 1921

(b) the is correct answer

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Answer 2

Einstein won the Nobel prize in physics in 1921.

“The” is used here because only one noble price is given each year for physics.
If it is given more than one, then we can use “a”

Hope it helps you.