Question

what designation is given to an orbital having n=4, l=1

Answer 1

Since, n is all about principal quantum number and l is Azimuthal quantum number, 

  When n = 4 and l=1, 

  The designation of this particular orbital will be 4p. 

  Electrons continue jumping from one orbital to another which is an endless process. If observed in detail, it is an interesting and continuous process. 

Answer 2

given that, n=4 and l=1

so we know that, n is all about principal quantum number and l is Azimuthal quantum number,

l=0 implies s orbital;

l=1 implies p orbital;

l=2 implies d orbital;

l=3 implies f orbital;

therefore,

l=1 is p orbital,

the answer is 4p orbital...

hope this helps :)