1 . Whenever a body strikes a stationary body of equal mass (a) the two bodies cannot stick together (b) the collision must be elastic (c) the body that was originally moving must stop (d) momentum is not necessarily conserved (e) total energy of all kinds is conserved 2. A student wishes to perform Young's double-slit experiment to measure the wavelength of light of a given source. The student has measured the average distance between adjacent dark bands and the distance from the slits to the screen. What other measurement is required to calculate the wavelength? a. the location of the central bright line b. the distance between the source and the slits c. the angle between the central bright line and first nodal line d. the distance separating the two slits e. the distance between the centre of the two slits and any given dark band 3. The photon model of light was proposed to account for several observations of the behaviour of light. Consider the following statements. I) A photon has a definite wavelength. II) A photon has a definite energy. Ill) A photon has a definite momentum. Which of the above statements is/are postulates of this model? (a) ll only (b) I and II only (c) I and Ill only (d) ll and Ill only (e) I, II and IllThe particle model of light requires some or all of the following assumptions: I) The particles are small in size compared to the spacing between them. II) The particles have very small mass. Ill) The particles are travelling very quickly. A beam of red light is observed to pass through a beam of blue light. In order to explain this observation, which of the above assumptions islare required? (a) I only (b) I\" only (c) I and II only (o) land \"I only (e) I, II and Ill Which one of the following properties of a wave decreases as the wave moves along a spring? (a) amplitude (b) wavelength (c) speed (d) frequency (e)penod A source S generates circular waves on a lake. The pattern of wave crests is shown in the diagram below. If the frequency of the source is 2.0 Hz and the wave speed is 5.0 mrs then the distance between adjacent wave crests is (a) 0.20 m (o) 0.40m (c) 1.25m (o) 2.5m (a) 10m