How many photons are contained in a flash of green light (525 nm) that contains 189 kj of energy?

There are 4.99 × 10²³  photons contained in a flash of green light (525 nm) that contains 189 kJ of energy.

First, we will calculate the energy (E) of each photon using the Planck-Einstein's relation.

where,

Each photon has an energy of 3.79 × 10⁻¹⁹ J. The number of photons that amount to 189 kJ (189 × 10³ J) of energy are:

There are 4.99 × 10²³  photons contained in a flash of green light (525 nm) that contains 189 kJ of energy.

You can learn more about photons here:

i'm pretty sure its b i might be wrong though!

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