10. Describe the experiment represented by the diagram. How does this extend our understanding of the wave-particle nature of light? (C: /5) probability that an electron will strike screen electrons double slit case 1 case 2 case 3 case 4 number of electrons 20 100 300 > 10 000 1 1. A student stretches a string horizontally between two retort stands such that the tension in the string is 1000 N. What is the maximum mass that the student can hang from the centre point of the string while still keeping the string perfectly horizontal? Explain your answer. (T: /3) 12. Two charges q, = -25 C and q; = 4.0 C are placed 0.012 m apart. A third negative charge q, is placed a distance L from q, as shown. If the net electric force on q2 is 0 N, what is the value of L? (T: /6) 13. Violet light of wavelength 400 nm is sent from air into quartz, index of refraction 1.46. What is the wavelength of the light inside the quartz? (T: /5) 14. The conversion between electron-volts and joules is 1 ev = 1.60 x 10""J. The work function for silver is 7.43 x 10- J. What is the work function for silver expressed in electron-volts? (T: /5) 15. A ship sailed 15.2 km [E 20.0 N] to go around a shoal, and then 22.4 km [W 40.0 N] to reach harbour. Use vector components to determine the total displacement of the ship. (T: /6)