A wave pulse (shown to the right) is trawling on a long rope to the left, toward
ID: 2076794 • Letter: A
Question
A wave pulse (shown to the right) is trawling on a long rope to the left, toward a boundary with "free" boundary conditions. Which of the illustrations below could be a snapshot of the rope at a later time? Two identical violin strings, with the same tension, mass density, and length, produce a frequency of 400 Hz when plucked. The tension in one of the strings is then increased by 4%. Beats with a period of _____ are then heard when these strings are plucked simultaneously. (a) 0.063 s (b) 0.125 s (c) 4 s (d) 8 s (e) 16 s White light is normally incident on a thin layer of water (n = 1.33) that covers a thick glass slide (n = 1.5). Light of wavelength lambda (measured in air) is not seen in the light reflected from the slide (completely destructive interference). How much more water must be added to the slide (i.e., how much should the thickness of the water layer be increased) in order to observe the greatest amount of light of this wavelength reflected from the slide? (a) lambda/(2) (b) lambda/(2.66) (c) lambda/(3) (d) lambda/(5.32) (e) lambda/(6) The diffraction pattern of a single slit is observed with green light. The green light is then replaced by (longer wavelength) red light. Which of the following simultaneous changes will allow the locations of the diffraction minima near the center of the screen to remain relatively unaffected by the change of the light's color? (a) Decrease the width of the slit. (b) Move the screen away from the slit. (c) Move the slit closer to the screen. (d) Move the red light source closer to the slit. (e) Increase the intensity of the red light.Explanation / Answer
the correct option will be c as the wave form in the given question increases, decreases and remains constant. the same is observed only for option C. also the wave cannot take negative axis. hence C is correct