How many photons are incident on the skin

Assignment Help Physics

Reference no: EM13318405

One of the first signs of sunburn is the reddening of the skin (called erythema). As a very rough rule of thumb, erythema occurs if 16 mJ of ultraviolet light of approximately 297-nm wavelength (referred to as UVB radiation) is incident on the skin per square centimeter during a single exposure. How many photons are incident on the skin in this amount of exposure?

Reference no: EM13318405

Questions Cloud

Explain in detail humanistic perspective : Trephination is one of the earliest trace in history, about the treatment of mental disorders date back to the stone age that was more than half a million years ago. Present a brief sketch of earlier types of explanations of mental illness and differ..

What the magnitude of the impulse the earth received : A stone is dropped from a high building which is 3630 cm. when the stone has fallen 20m, what the magnitude of the impulse the Earth received

Find location of point a on the table by calculating length : A pool player wants to bank ball B off of point A into the side pocket O. The ball has a diameter d = 2.25 in. and a coefficient of restitution e = 0.8 when colliding with the side of the table.

Manufacturing operations for a total selling price : On January 15, 2013, Leno, Inc., which has a March 31, year-end, entered into a transaction to sell the land and building that contained its manufacturing operations for a total selling price of $19,750,000.

How many photons are incident on the skin : One of the first signs of sunburn is the reddening of the skin (called erythema). How many photons are incident on the skin in this amount of exposure

How fast will ball c be traveling after all collisions cease : Three particles are sliding along a flat, frictionless surface. mA = 0.4 kg, mB = 0.5 kg, and mC = 0.4 kg. Before any collisions take place, vA = 15i m/s, vB = 10im/s, and vC = 5 m/s. e = 0.85 between A and B and e = 0.6 between B and C.

Find out the volume of the container after n2 and h2 reacted : The N2 (g) and H2 (g) are allowed to react, producing NH3 (g): N2 (g) + 3 H2 (g) 2 NH3 (g) If the initial volume of the container, before any reaction takes place, is 2.50 L, determine the volume of the container after the N2 (g) and H2 (g) have r..

Site annual fixed cost variable cost per auto produced : Audi Motors is considering three sites – A, B, and C, at which to locate a factory to build it’s new model automobile, the Audi SUV XL500. The goal is to locate at a minimum cost site, where cost is measured by the annual fixed plus variable costs of..

Find how high the small ball bounces if its mass is m : When the larger ball hits the ground and then collides with the smaller ball, it causes the small ball to bounce to a height several times greater than that from which the balls were originally released.

User Account

All Pages