What is the wavelength of a light of frequency 7.21?

Why are some galaxies’ spectra blueshifted rather than redshifted? question 4 options:

What is the internal energy of 4.00 mol of diatomic nitrogen gas n2 at 455k

6–48 bananas are to be cooled from 24 to 138c at a rate of 215 kg/h by a refrigeration system. the power input to the refrigerator is 1.4 kw. determine the rate of cooling, in kj/ min, and the cop of the refrigerator. the specific heat of banana above freezing is 3.35 kj/kg·8c.