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I/GCSE Physics Question Analysis - Physics - Short Questions

I/GCSE Physics Question Analysis

· igcse physics,physics,neutrinos,pn junction

I/GCSE Physics Question Analysis Topic: Physics - Short Questions

Exam Questions:

1) Why is it experimentally difficult to detect neutrinos in nuclear β-decay?

2) Explain, with the help of a circuit diagram, the working of a p-n junction diode as a half-wave rectifier.

Answers:

For I/GCSE Physics, you should know:

1) Because they have essentially no mass and no charge, neutrinos do not readily interact with any matter - making them difficult to detect experimentally in β decay.

2) A p-n junction diode conducts current when in forward bias and blocks it in reverse bias.

In a positive cycle, a p-n junction diode is forward biased. When a diode is such, its resistance, R D, is zero or it shorts out, resulting in an input voltage that is equal to its output voltage.

In the negative cycle, the p-n junction diode is reverse biased. Reverse bias causes the output voltage of the diode to be zero and the diode's resistance, R D, to be equal to infinity.

As a result, only positive cycles are permitted to pass through the p-n junction.

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Work hard for your I/GCSE Physics examination!

End of analysis. Great!

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