14 An ultrasound source and two ultrasound detectors are set up as shown. detector 1 source detector 2 The detectors are connected to an oscilloscope and photograph 1 shows the traces that are recorded. detector 1 trace detector 2 trace photograph 1 Detector 2 is moved slightly further away from the source and photograph 2 shows the traces that are recorded. detector 1 trace detector 2 trace photograph 2Explain the change in the traces between photograph 1 and photograph 2