A-Level Physics Question Analysis Topic: Physics - Short Questions
Exam Questions:
1) Differentiate between half life and average life of a radioactive substance.
2) Explain briefly the following terms used in communication system:
(i) Transducer
(ii) Repeater
(iii) Amplification
Answers:
For A-Level Physics, you should know:
1) Half Life
Definition: It is the time required for half of a particular radioactive substance to decay.
It is denoted by t1/2.
It is also equal to ln 2 / λ, where λ is the decay constant.
On the other hand,
Average Life
Definition: It is the expected life for a radioactive substance which is in a particular sample.
It is denoted by τ.
It is also equal to 1 / λ.
2) Transducer: Converts one form of energy into another form. For example, the transducer in a microphone converts sound energy into electrical energy.
Repeater: Put simply, it receives signals and retransmits it. Useful for extending transmissions (over longer distances or to get past obstructions)
Amplification: As a signal travels further, its strength decreases. Amplication makes sure to prevent this issue by increasing the signal's strength.
Work hard for your A-Level Physics examination!
End of analysis. Great!