Ajeweler working with a heated 47 g gold ring must lower the ring's temperature to make it safe to handle. if the ring is initially at 99ºc, what mass of water at 25ºc is needed to lower the ring's temperature to 38ºc? 5.9 g 3.7 g 2.2 g 6.8 g

Glass is transparent to visibile light under normal conditions; however, at extremely high intensities, glass will absorb most of the light incident upon it. this works through a process known as multiphoton absorption. in this process, several photons are absorbed at the same time. if very intense light whose photons carry 2ev of energy is shined onto a material with a band gap of 4ev, that light can be absorbed through two-photon absorption, because two photons have the right amount of energy to bridge the band gap. what is the minimum number of photons of 800-nm light that are needed to equal or exceed the band gap of fused silica glass

The earth is constantly spinning on its axis, like you might spin a basketball on your finger. it is this spinning of the earth that causes

Determine the age of a fossil if it had only one eighth of its original carbon-14 content remaining?