Question

delivered to the eye during a pulse? wine birthmarks, which are caused by malformed cap- e to the skin, can be removed with laser pulses. Laser light of the right color will pass through the skin with little absorption but will be strongly absorbed by oxyhemoglo- bin in the blood of these capillaries, which destroys them with- out damaging adjacent tissue. A typical system uses a series of 6900 W pulses of 385 nm laser light. Each pulse lasts 0.45 ms. 50. How many photons are in each pulse? lnser emits an intense pulse of light that lasts a mere mh

Answer 1

The energy of the photons is, E Pt (6900 w)(0.45x10 's) 3.105J The energy of photons is also written as, Nhc Solve the equation for the number (N) of photons, Nhc EA hc (3.105J) (585x 10° m) 6.626x 10-34 J s (3.0x108 m/s 9.137 x1018 photons 9.14 x1018 photons