Using the conversion factor from ev (electron volts) to joules, determine which energy line for an electron dropping from one energy level to another would show a line at 435 nm in an emission spectrum. use the formulas and the energy level information below to answer the question.
needed constants:

1.00ev = 1.6 * 10^-19 j
c = 3.00 * 10^8 m/s
h = 6.63 * 10^-34 j*s

energy level values:
e6: e= -0.378 ev
e5: e= -0.544 ev
e4: e= -0.850 ev
e3: e= -1.51 ev
e2: e= -3.403v

If the speed of a particle triples ,by what factor does its kinetic energy increase?

An object of dimensions 50 cm x 40 cm x 0.20 cm has a mass 60g. find its density in g/cm3 and kg/ m3

Astudent is performing an experiment comparing sound and light waves. the student gathers the following data. what conclusion does the student most likely make based on this data? light waves always travel the same speed; however, the speed of sound is determined by the medium that it travels through. all sound waves always have the same energy, so the temperature of the medium does not affect wave speed. light needs to vibrate particles, so it travels fastest in tightly packed solids, while sound does not need a medium, so it travels fastest in a gas. tightly packed particles in solids slow down the light waves; however, sound waves make particles bounce into each other, so they travel faster in solids.