Human skin is relatively insensitive to visible light, but ultraviolet radiation can cause severe burns. Does this have anything to do with photon energies? Explain

One litre of mixture of O_2 and O_3 at STP was allowed to react with an excess of acidified solution of KI. The iodine liberated required 40 " mL of " (M)/(10) sodium thiosulphate solution for titration. What is the mass per cent of ozone in the mixture? Ultraviolet radiation of wavelength 300 nm can decompose ozone. Assuming that one photon can decompose one ozone molecule, how many photons would have been required for complete decomposition of ozone in the original mixture?

If 10% of the energy supplied to an incandescent light bulb is radiated as visible light, how many visible light photons are emitted by 200watt bulb? Assume wavelength of all visible photons to be 5000Å. Given h=6.6xx10^(-34)Js .

In termsof biological damage, ionization does more damage when you stand in front of a very weak (low power) beam of X-ray radiation than infront of astronger beam of red light. How does the photon concept explain this paradoxical situation?

The human eye is most sensitive to green light of wavelength 505 nm. Experiments have found tthat when people are kept in a dark room until their eye adapt to the darkness, a single photon of green light will trigger receptor cells in the rods of the retina. The velocity of typical bacterium of mass 9.5xx10^(-12) g, if it had absorbed all energy of photon ,is nearly

Infrared, visible and ultraviolet radiations/light have different properties. Which one of the following statements related to these radiations/light is not correct?

A 100 watt bulb radiates 15% of energy given in the form of visible light . If wavelength of the visible photons are nearly 5,000Å , then calculate the number of visible light photons emitted per second.