What is the speed of a wave that has a frequency of 220 Hz and a wavelength of 0.39 m?
A. 0.002 m/s
B. 564 m/s
C. 85.8 m/s
D. 0.01 m/s

Cobalt-60 is an artificial radioisotope that is produced in a nuclear reactor and is used as a gamma-ray source in the treatment of certain types of cancer. if the wavelength of the gamma radiation from a cobalt-60 source is 1.00 × 10-3 nm, calculate the energy of a photon of this radiation.

In this chemical reaction, 325 grams of barium (ba) react completely. how many moles of lithium (li) are produced?

0.09 moles of sodium sulfate in 12 ml of solution