What is the energy difference between the second excited state and first excited state of an electron in the "box" of size l=1nm? a) 1.9 ev b) 1.1 ev c) 0.6 ev d) 0.3 ev e) 0.2 ev

3. a particle with initial velocity v⃗ 0=(5.85×103m/s)j^ enters a region of uniform electric and magnetic fields. the magnetic field in the region is b⃗ =−(1.35t)k^. you can ignore the weight of the particle. a. calculate the magnitude of the electric field in the region if the particle is to pass through undeflected, for a particle of charge +0.640 nc.