You are repeating the Hershey-Chase experiment and are provided with two isotopes 32p and 15N (in place of 35S in the original experiment). How do you expect your results to be different?
The use of 15N will not give any conclusive result because it is only a heavy isotope of nitrogen. In the original experiment, 35S was detected only in the supernatant as it was incorporated in protein only, while 15N will be incorporated into proteins as well as in DNA and hence it would appear both in the supernatant and in the sediment as well.
