Hi I am in desperate need of help hahaha <3 The initial temperature of the mixture was +20 °C.
The mixture froze at -1.5 °C.
A total of 165 kJ of internal energy was transferred from the mixture to cool and freeze it.
Specific heat capacity of the mixture = 3500 J/kg °C
Specific latent heat of fusion of the mixture = 255 000 J/kg
Calculate the mass of the mixture.
Give your answer to 2 significant figures

The nuclear potential that binds protons and neutrons in the nucleus of an atom is often approximated by a square well. imagine a proton conned in an innite square well of length 105 nm, a typical nuclear diameter. calculate the wavelength and energy associated with the photon that is emitted when the proton undergoes a transition from the rst excited state (n 2) to the ground state (n 1). in what region of the electromagnetic spectrum does this wavelength belong?