b) Depict digital signal 101101001 in (i) unipolar RZ, (ii) bipolar NRZ, (iii) bipolar RZ, and (iv) Manchester code. 

In communication physics, digital signals can be represented using different line coding schemes to transmit binary data over physical media. Below is a depiction of the digital signal 101101001 using various schemes:

### (i) Unipolar RZ (Return to Zero)  
In Unipolar RZ coding, a binary 1 is represented by a high voltage for the first half of the bit duration and returns to zero for the remaining half. Binary 0 remains at zero voltage throughout.  
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