3 The Sun emits ultraviolet photons of energy 1.6 x 10" from a relatively thin layer called the chromosphere.
3 (a)
(1) Calculate the wavelength of a photon of this energy.
3 (a) (i) The photons are emitted by atoms of hydrogen gas at a temperature of 15 000 K.
Calculate the mean kinetic energy of an atom of a gas at this temperature.

Customers are used to evaluate preliminary product designs. in the past, 93% of highly successful products received good reviews, 51% of moderately successful products received good reviews, and 14% of poor products received good reviews. in addition, 40% of products have been highly successful, 35% have been moderately successful and 25% have been poor products. round your answers to four decimal places (e.g. 98.) what is the probability that a product attains a good review? (b) if a new design attains a good review, what is the probability that it will be a highly successful product? (c) if a product does not attain a good review, what is the probability that it will be a highly successful product?