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ANSWER THE QUESTION

Let's try some electronic questions

1- When a doped semiconductor contains excess holes it is called "p-type", and when it contains excess free electrons it is known as a what?

2-In some semiconductors, excited electrons can emit light instead of producing what?

3-Alexander Graham Bell in 1880 used the light-sensitive property of selenium to send sound over a what?

4-The original transistors made at Bell Labs were made from what semiconductive element?

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