What is the difference between an orbit and orbital ?

What is an orbital ?

There is no difference between a 2p and a 3p orbital regarding

1) How man.y orbitals are there in p-subshell ? 2) How many electrons are there in d-subshell ? 3) Write the corresponding orbitals for l = O, 1, 2, 3. 4) What is the relation between l and number of orbitals and l and number of electrons?

The ratio of the difference between the first and second Bohr orbit energies to that between second and third Bohr orbit energies is

What is the circumference of the second orbit of hydrogen atom?

What is the circumference of the second orbit of hydrogen atom ?