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I/GCSE Physics Question Analysis - Physics - Short Questions

I/GCSE Physics Question Analysis

· IGCSE Physics,radioactivity,circuits

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

Exam Questions:

1) Define the activity of a given radioactive substance. Write its S.I units.

2) Explain with the help of a circuit diagram the working of a photo diode. Write briefly how it is used to detect the optical signals.

Answers:

For I/GCSE Physics, you should know:

1) The rate at which a radioactive material is decaying is known as its activity.

Becquerel is the SI unit of activity (Bq).

2) A photodiode is a junction diode made of a light-sensitive semiconductor.

A photodiode is an electrical device that uses a photo detector to detect light and transform it into an energy signal.

The way a pn-junction works is determined by the light that reaches it.

Let's suppose that the wavelength is such that the energy of a photon hv / λ is enough to break a valence bond. When this happens, the number of charge carriers increases which thus increases the conductivity of the junction. Should the junction be connected in a circular configuration, the intensity of the incident light would control the circuit's current.

Circuit diagram:

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Work hard for your I/GCSE Physics examination!

End of analysis. Great!

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