Acertain minimum energy, , is required to eject an electron from a photosensitive surface. any energy absorbed beyond this minimum gives kinetic energy to the ejected electron. when 510.-nm light falls on a cesium surface, an electron is ejected with a kinetic energy of 8.85×10-20 j. when the wavelength is 430. nm, the kinetic energy is 1.61×10-19 j. a calculate for cesium, in joules.

answer: the rock sample is a sedimentary rock.

explanation:

it is given that:

mass of rock sample, m = 2.7 g

volume of rock sample,

so, density of rock sample will be

since, the density of rock sample is . hence, the rock sample is a sedimentary rock, whose densities varies between .

the first american roller coaster was the mauch chunk switchback railway, built in the mountains of pennsylvania in the mid-1800s. the track, originally built to send coal to a railway, was reconfigured as a "scenic tour."

this is a good question! i'll do some research and come back when i have the answer!

the answer is a. hope this .