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A semi-conductor X is made by doping a germanium crystal with arsenic (Z = 33). A second semi-conductor Y is made by doping germanium with indium (Z = 49). The two are joined end to end and connected to a battery as shown. Which of the following statements is correct-

1. X is p-type, Y is n-type and the junction is forward biased.
2. X is n-type, Y is p-type and the junction is forward biased.
3. X is p-type, Y is n-type and the junction is reverse biased.
4. X is n-type, Y is p-type and the junction is reverse biased.

Correct answer: X is n-type, Y is p-type and the junction is reverse biased.

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