Before the development of LCD and plasma televisions, cathode rays were commonly used in television sets. An electric field would cause electrons to accelerate and then magnetic coils would be used to direct the beam of electrons to various positions on a screen covered in phosphorus. When the electrons struck the phosphorus, it would create tiny dots of red, blue or green light. Moving the electron beam across the screen at high speeds would then generate an image. a. If a beam of electrons in a television set is deflected into a circular path with a radius of 0. 106 mm while travelling through a perpendicular magnetic field with a strength of 0.0700 T, what speed were the electrons travelling at? b. Determine the potential difference required to get an electron to reach this speed. B I E U S X2 X2 D C CWhen bubble chambers were in common use they allowed for the analysis of many nuclear particles. A photograph was taken showing the tracks of subatomic particles through a bubble chamber inside a magnetic field. Identify the track(s) that is/are most likely produced by an electron. C 4 Particles enter from here D Select one: O a. A only O b. C only O c. A and B O d. B and CWhen a neutron decays it produces a beta-negative particle and a(n) Select one: O a. alpha particle and antineutrino O b. proton and antineutrino O c. proton and electron O d. proton and neutrino Traser watches have a lighting system that uses tubes containing tritium (also called hyrdrogen-3) that has a half-life of 12.32 years. The tritium undergoes beta-negative decay. The emitted beta-negative p collide with phosphorus based molecules coated on the inside of the glass tubes to produce a green light. Determine the percent tritium remaining after 20 years. Select one: O a. 32% O b. 35% O c. 65% O d. 68%When a beam of electrons are aimed at a series of double slits in a crystal, the pattern formed on the screen behind the crystal indicates that the electrons Select one: O a. could have wave properties O b. could have particle properties O c. may be waves or particles O d. may be neither waves or particles Identify the region of the electromagnetic spectrum for the photon emitted when an electron moves from energy level 2 to energy level 1 within the hydrogen atom. Select one: O a. visible O b. infrared O c. ultraviolet O d. radio waves beta-negative particle and a(n)The concepts of stationary states for electrons in around a nucleus is used to explain Select one: O a. the nucleus of an atom O b. deBroglie wavelength O c. black body radiation O d. atomic spectra A gas in a cathode ray tube produces the line emission spectra shown containing four bright lines. 100 pm 200 nm 300 nm 400 nm The wavelength shown having the greatest energy has an energy of Select one: O a. 2.21 x 10-18 J O b. 1.66 x 10-18 J O c. 5.53 x 10-19 J O d. 491 x 10-19 JClear my choice A charged particle of unknown identity is sent through a cathode ray tube. It then enters a perpendicular magnetic field of 0.30 T with a speed of 4.0 x 10 m/s and follows a circular path with a radius of 9.0 cm. The charge-to-mass ratio of this unknown particle is Select one: O a. 6.8 x 10-8 C/kg O b. 6.8 x 10-7 C/kg O c. 1.5 x 105 C/kg O d. 1.5 x 108 C/kg Rutherford's nuclear model must be invalid because Select one: O a. a nucleus cannot exist in close proximity to electrons O b. accelerating charges should produce EMR O c. Thomson had proven that atoms are solid O d. electrons are waves A line-absorption spectra may be produced by Select one: O a. placing a large potential difference across a gas filled CRT O b. shining white light through a gas at room temperature O c. placing a chemical into a Bunsen burner flame O d. heating a gas to a very high temperature