Telecommunication SamplingWatch this thread
sampling frequency is selected to be >= twice the highest frequency you want to digitize.
compare the maximum audio frequency allowed by that sampling rate with the maximum audio frequency detectable by human hearing (something that'll be in the syllabus if you're getting questions of this type) and make some conclusion about the suitability of that sampling frequency.
The word length governs the number of signal levels that are processed - the number of levels is 2^n where n is the number of bits
try to say something about the effect of using fewer bits and how accurately the original signal could be recreated from the digital data.
IIRC 44.1 kHz & 16 bits are the parameters for CD digital audio (on two separate channels for stereo)