i really could use some help, with these questions, i would really appreciate it.?

Question

1.According to the particle model of light certain kinds of light cannot eject electrons from metals because...?

2.A mass of 6.005g of carbon contains....?(i don't get what thats asking)

3.when an electrical current passed through a glass tube, a paddle wheel placed between the electrons moved. Scientists concluded that......?

please help!!!!

Answer 1

This is what i am teaching in class right now!

Each color gives off a certain wavelength of light. these various wavelengths have a certain frequency...the higher the frequency the higher the energy given off...so in order to eject electrons (or photons) from metals, it must have a high enough frequency...

dont know what they want for number 2 either.

going back to the first question: all elements give off electrons when hit by energy. scientists concluded that a stream of photons ( electrons) can travel in a line between a positive cathode and a negative anode... this is how J.J. Thomson discovered the electron.

Answer 2

1. the light has to have a certain strength to eject electrons from a metal. See photoelectric effect. "An electron is ejected if it gains sufficient energy to overcome te forces binding the electron to the surface. Energy beyond the binding energy appears as kinetic energy of the emitted electron."