PLEASE HELP ME WITH THIS PHYSICS ASSIGNMENT THERES A TIME LIMIT

Question 7 Refer to the diagram below to answer this question. Not yet Time left 2:29:51 answered A wave front moves toward a barrier. The numbered wave fronts represent Marked out of 1.00 suggested segments of the reflected wave front. Flag question Barrier IV ~ Direction of the motion for the III wave 'Wave front Which of the lines best represents the portion of the wave front after it has been reflected from the barrier? Select one: O a. IV Ob. I O c. III O d. IIQuestion 2 Refer to the diagram Closed-Pipe Resonance to answer this question. Not yet answered Closed-Pipe Resonance A tuning fork held over a closed pipe produces resonance for particular lengths (4 Time left 2:29:39 Marked out of 1.00 (This diagram is not to scale.) Flag Tuning fork B question Tuning fork A Sliding closed-pipe tube Water Tuning fork A is held over the end of the variable-length closed pipe. The length (L) of the pipe is gradually increased. As the pipe gets longer, the sound of the tuning fork first gets louder, then softer, then louder again. In terms of the wavelength of the sound produced by the tuning fork, the series of numbers that represents possible values for the length of the pipe at which you would hear the loudest sound is selection a L = 1 x and La 4 c. L = - x and 3 x 2 b. = -x and 2 x d L = - A and 12Question 3 A wave travels across a lake at a speed of 1.39 m/s. A cottager determines that it takes 85.0 s Not yet answered for 25 waves to arrive at the shore. The wavelength of these waves is m. Marked out of (Record your three-digit answer in the answer box.) 1.00 Flag questionTime left 2.29.25 Question 4 A light spring is stretched on the floor. Two students do a series of trials to determine what Not yet happens when two pulses meet as they travel along the spring. In each trial, each of the answered students, at opposite ends of the spring, simultaneously create a pulse. These pulses travel Marked out of along the spring in opposite directions so that they arrive at the midpoint of the spring at 1.00 the same time. The pulses that the students create are of different amplitudes and lengths. Flag After observing the interactions of several trials, which of these conclusions could the question students make about the interaction of the pulses? Select one: O a. When the pulses meet, they bounce off each other and move back toward the student who created each pulse. O b. When the pulses meet, they combine and then create two new pulses that are identical to each other and that move away from the midpoint in opposite directions. O c. When the two pulses meet, they combine to form a single pulse that is a combination of the two original pulses. The combined pulse moves away in the direction of the pulse with the greater amplitude. O d. When the two pulses meet, they pass through each other and continue on their way, seemingly unaffected by the interaction with the other pulse.Question 5 A car with a 295-Hz horn is driving toward you at a speed of 21.0 m/s. If the speed of sound Not yet in air is 334 m/s, what is the frequency at which you would hear the horn? answered Marked out of Select one: 1.00 O a. 315 Hz Flag question O b. 342 Hz O c. 328 Hz O d. 334 HzQuestion 6 Circular Waves Moving Outward from a Source (S) Not yet answered Marked out of A 1.00 Flag question . 8 H F .S C Refer to the diagram Circular Waves Moving Outward from a Source (S) to answer this question. Which pair of letters indicate wave fronts that are one wavelength apart? Select one: O a. D and G O b. G and J O c. E and J O d. B and H