Question

Using the diagram below, complete the following a) Calculate the wavelength of the photon that would ionise an electron from the ground state, b) Calculate the wavelength of the photon that would excite an electron from the n-2 to the n 5 energy level. c) An incoming electron collides with an atomic electron at energy level n-2, rising it to energy level n 3. If the initial kinetic energy of the incoming electron was 3.54ev calculate its final kinetic energy d) An atomic electron is ionised and left with kinetic energy 3.52eV. if it was ionised by collision with an electron with initial kinetic energy 9.62eV and final kinetic energy 3.39eV, then calculate the initial energy level of the atomic electron. 011 AC4.2 ionisation n-5 na4 -2.7lev n-3 n-2 -5.55ev 10.44ev A cell with emf 15V and internal resistance 5.60 is connected in series to an ammeter a 0-3.9MQ variable resistor. A voltmeter is connected across the terminals of the cell. a) Sketch the circuit diagram b) Describe how this circuit can be used to obtain a value for the emf of the cell c) Sketch and label thegrap -- d) Calculate the terminal voltage when a current of 87.9mA Is measured by the ammeter e) Calculate the load resistance when a current of 55.8mA is measured by the ammeter f) Describe several limitations of this investigation 012 AC5-11 August 2018 Page 4 of 11

solve Q11 & Q12

Answer 1