At a distance of 10 cm from a presumably isotropic, radioactive source, a pair of students measure 74 cps (cps = counts per second). on average, how many counts per second do you expect at a distance of 22 cm? (note that the average number of counts per second need not be an integer.)

d eras and periods

the temperature in kelvin of 2.0 dm3 of an ideal gas is doubled and its pressure is increased by a factor of four. what is the final volume of the gas

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2