# Transmitter interference

### Explanation of question 9

A low-pass filter will attenuate

1. frequencies above a particular value
2. frequencies below a particular value
3. voltages above a particular value
4. voltages below a particular value

The answer is :- 1

Illustrated (above) is a low-pass filter. When a high frequency signal is applied to the input, the capacitive reactance of the capacitors(1/2fC) will be low and the signal will not reach the output. Low frequency signals are passed easily by the inductor since the inductive reactance (2fL) will be low.

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