An electron is ejected from a metal with a velocity 6.70 x 105 m/s. If the metal has a threshold frequency of 1.50 x 1015 Hz, what was the wavelength of the incident

photon?

the positions which points up in upward carbon and down in downward carbon are axial

and vice versa holds true for equatorial positions

so the correct answer with labelled diagram will be

c-14 is carbon-14, or radiocarbon.   it is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons.