Which of the following orbitals has a dumbbell shape?

For $n = 4$,what is the total number of orbitals?

What is the designation of an orbital with quantum numbers $n=4$ and $l=3$?

The quantum numbers of six electrons are given below. Arrange them in order of increasing energies. If any of these combination$(s)$ has/have the same energy,list them:
$(1).$ $n=4, l=2, m_l=-2, m_s=-1/2$
$(2).$ $n=3, l=2, m_l=1, m_s=+1/2$
$(3).$ $n=4, l=1, m_l=0, m_s=+1/2$
$(4).$ $n=3, l=2, m_l=-2, m_s=-1/2$
$(5).$ $n=3, l=1, m_l=-1, m_s=+1/2$
$(6).$ $n=4, l=1, m_l=0, m_s=+1/2$

What is the similarity between $2p_x, 2p_y$ and $2p_z$ orbitals?

The number of waves made by an electron moving in an orbit having a maximum magnetic quantum number $(m_l) = 3$ is: