1. In Thomson's experiment on cathode rays, the speed of the cathode ray particles was found to be 4.0 x 10⁷ m/s in a 1.0 x 10^-4 T magnetic field. The corresponding electric field was provided by a charged parallel plate capacitor that had a separation of 2.0 cm. What was the potential difference across the plates? (80 V)
2. Alpha particles travel undeflected through magnetic and electric fields that are perpendicular to each another.The speed of the alpha particles is 7.50 x 10⁵ m/s and the strength of the magnetic field is 0.220 T.What is the electric field strength? (1.65 x 10⁵ V/m)
3. In a cathode ray tube electrons are accelerated from rest by a potential difference of 1.40 kV. If these electrons enter a magnetic field with a strength of 0.0220 T, what is the radius of arc for the deflected electrons? (5.74 mm)
4. An electron is accelerated upward at 5.2 m/s² towards the positive plate when released. If the plates are set 15 mm apart, what is the potential difference applied across the plates? (-1.28 x 10^-12 V)
5. Electrons are accelerated through hydrogen gas at room temperature in a Franck-Hertz experiment by a potential difference of 12.3 V.What wavelengths of light can be expected to be emitted by the hydrogen? (122 nm, 103 nm, 657 nm)
6. Electrons are accelerated in a Franck-Hertz experiment through mercury vapour (see Hg energy level diagram above) with a potential difference of 7.0 V.Whatare the energies of all the photons that may be emitted by the mercury vapour? (4.9 eV, 6.7 eV, 1.8 eV)