Virus in spherical shape...?

Question

A typical virus is a packet of protein and DNA (or RNA) and can be spherical in shape. The influenza A virus is a spherical virus that has a diameter of 85 nm. If the volume of saliva coughed onto you by your friend with the flu is 0.023 cm3 and 10-9 of that volume consists of viral particles, how many influenza viruses have just landed on you?

Answer 1

85e-9 m = 85e-7 cm

V = (4/3)π(85e-7 cm)^3

V ≈ 2.5724e-15 cm^3

(0.023e-9)/(2.5724e-15) ≈ 8,941 viruses