What is the energy in electron-volts (ev) of a photon of green light that has a wavelength of 520 nm? (1.0 m = 1.0 × 10^-9m)

3.8 × 10^-19ev
3.4 × 10^-40ev
2.4ev
2.2 × 10^-21ev

Which is not a step in the rock cycle?

A500g object falls off a cliff and losers 100 j from its gravitational potential energy store. if the gravitational field strength g=9.8n/kg, how high is the cliff?

One day, after pulling down your window shade, you notice that sunlight is passing through a pinhole in the shade and making a small patch of light on the far wall. you see that the patch of light seems to be a circular diffraction pattern. it appears that the central maximum is about 1 cm across and you estimate that the distance from the window shade to the wall is about 3 m. what is (a) the average wavelength of sunlight? (b) the diameter of the pinhole?