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The impurity in the germanium is usually in the ratio of?A = 1: ...

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Question:
The impurity in the germanium is usually in the ratio of?
A = 1: 10 ⁴
B = 1 : 10 ⁸
C = 1 : 10 ¹²
D = 1 : 10 ¹⁶

Option A):
C
Option B):
D
Option C):
B
Option D):
A

Correct Answer is Option B):
D