Answer:
The experiment wont work because both DNA and Protein contain nitrogen in their structure.
Step-by-step explanation:
DNA and protein both contain nitrogen but phosphate group is present in DNA but absent in Protein.So when those 2 students tried to lebel the nitrogen of DNA it can be possible that nitrogen of protein molecule is being lebelled rather than the nitrogen of DNA.
As a result those 2 students do not found any trace of nitrogen of phage DNA inside the host Bacterium because the lebelled protein of the capsid remains outside the bacterium in form of ghost.