Physics for IGCSE & O level - Waves And Sounds (Section 7 - No. 21)
What is the difference between the trace that will appear on the oscilloscope after a flaw in the metal?
Two reflected pulses are picked up
The pulse reflected from the flaw returns first
The pulse reflected from the far end of the metal returns first
The trace on the screen is a graph showing how the amplitude (strength) of the ultrasound varies with time
설명
Two reflected pulses will be picked up, pulse from the flaw first and then from the end, and the trace will show the amplitude over time