Answer:
3.847 x 10^44
Explanation:
density is mass per unit volume.
we know the mass of the proton which is 1.0073 amu.
so density is mass/volume.
now we need to find the volume. a photon is spherical in shape. the equation for volume of a sphere is 4/3 πr^3.
we know the diameter which is 1.71 x 10^-15 m so the radius is half of that which is 8.55 x 10^ -16
now substitute the value of r in the volume of sphere equation. we get 4/3 π(8.55x10^-16)^3 = 2.618 x 10^-45
to find the density divide mass by volume.
1.0073 / 2.618 x10^-45 = 3.847 x 10^44 amu/m^3
