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Any hints are very much appreciated!

## Homework Statement

I firstly got converted the 5eV to joules which gave m 8 x 1017. Metal X has a work function of 5.0 eV and is used in a demonstration of the photoelectric effect.

a) What is the min. frequency needed to remove electrons from X?

^{-19}. I then divided that by the planck's constant to get my final answer of 1.21 x 10

^{15}Hz

I got the wavelength of 2.49 x 10b) What is the wavelength of these waves?

^{-7}, by dividing the speed of an EM wave by the answer to A.

I'm afraid this is where I get stuck. The possible equations that I know are KE = 0.5mvc) If metal X was irradiated with EM waves of frequency 2.0 x 1015 Hz, what will be the maximum kinetic energy of the photoelectrons released?

^{2}and hf = φ + ½ mv

^{2}

_{max}but here I am unsure of the theory. :(

Pretty sure this is the particle model. Unsure of how to calculate the wavelength though, any ideas?18. In the following two situations, calculate the de Broglie wavelength and, hence, state whether the particle or the wave model should be used.

a) Neutrons (m=1.8x10^{-28}kg) moving at 107ms^{-1}passing a gap of 8x10^{-10}m

I'm pretty sure this is the wave model. Same as the previous question.b) Electrons with a momentum of 4x10^{-19}kgms-1 passing nuclei diameter 10^{-15}m

Thanks for reading!