Unit 1 3.0 / 5 based on 1 rating ? PhysicsASAQA Created by: Aishwaya ChauhanCreated on: 04-12-12 23:26 what do line spectra give evidence for in a gas? atomic energy levels 1 of 11 in the equation, hf=E1-E2, identify each term and their units h=plancks constant (Js) f= frequency (Hz) E1 E2= energy levels 2 of 11 what is excitation? what is de-excitation? electron gains energy so it moves to a higher energy level. goes to a lower level and photon is produced 3 of 11 what is the particle and wave behavior of light? photoelectric effect, diffraction by diffraction by diffraction grating 4 of 11 what is the particle and wave behavior of electrons? deflection, diffraction by graphite 5 of 11 In the equation λ=h/p=h/mv identify each term and give their units λ= wavelength (m) m=mass (kg) v=velocity (m/s) h=plancks constant m=momentum 6 of 11 in the equation V=W/Q identify each term and give their units v= potential difference (v) q= charge (c) w= energy (Js) 7 of 11 in the equation I= △Q/△t identify each term and give their units I= current (A) △Q= change in charge (c) △t= change in time 8 of 11 In the equation R=V/I identify each term and give their units r= resistance (ohms) v=voltage (volts) I=current (amps) 9 of 11 in the equation, p=RA/l p=resistivity r=resistance (ohms) A= cross section area l= lenght 10 of 11 what is meant by the critical temperature of a superconductor? temperature at and below which has zero resistance 11 of 11
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