The uv light that is responsible for tanning the skin falls in the 320-nm to 400-nm region. calculate the total energy (in joules) absorbed by a person exposed to this radiation for 2.5 h, given that there are 2.0 × 1016 photons hitting earth’s surface per square centimeter per second over a 80-nm (320-nm to 400-nm) range and that the exposed body area is 0.45 m2. assume that only half of the radiation is absorbed and the other half is reflected by the body. (hint: use an average wavelength of 360 nm in calculating the energy of a photon.)

What are segments of dna that code for a particular trait. a combination of dna and proteins make up what

Explain the difference between each pair of concepts. a. frequency and relative frequency b. percentage and relative frequency a. select the correct choice below. a. frequency is the total number of observations in a data set. relative frequency is the number of times a particular distinct value occurs. b. frequency is the number of times a particular distinct value occurs. relative frequency is the ratio of the frequency of a value to the total number of observations. c. frequency is the total number of observations in a data set. relative frequency is the ratio of the number of times a particular distinct value occurs to the frequency. d. frequency is the number of times a particular distinct value occurs. relative frequency is the ratio of the frequency of two different values.

An object weighs 40n in air, weighs 20n when submerged in water and 30n when submerged in a liquid of unknown density. what is the density of the liquid?