What is the charge on a photon?

If $h$ is Planck's constant,the momentum of a photon with a wavelength of $0.01 \ \mathring A$ is .........

If the energy of a photon is $10\,eV$,then its momentum is

According to the corpuscular theory of light,the different colours of light are due to

The value of Planck's constant is

The energy flux of sunlight reaching the surface of the earth is $1.388 \times 10^{3} \; W/m^{2}$. How many photons (nearly) per square metre are incident on the Earth per second? Assume that the photons in the sunlight have an average wavelength of $550 \; nm$.