Miracle Learning Centre

Miracle Learning Centre Physics Tuition Question on Sound. (O Level Science Tuition/IP Science Tuition/Secondary Science Tuition)

The figure below shows the oscilloscope trace from a concrete slab without any cavity. The pulses are obtained from the receiver. The voltage-gain of the oscilloscope is set at 2 mV/division and the time base at 0.05 ms/division.

(a) What is ultrasound? ………………………………………………………………………………………………. ……………………………………………………………………………………………….

(b) Estimate the time represented by the distance between pulses X and Y. time : …………………………..

(c) What does the time calculated in part (b) represent? ………………………………………………………………………………………………. ……………………………………………………………………………………………….

(d) Calculate the thickness of the concrete slab if the speed of ultrasound in concrete is 4 000 m/s. thickness : …………………………..

(e) What are the peak voltages of pulses X and Y? X : ………………………….., Y : …………………………..

(f) Why is pulse Y shorter than pulse X? ………………………………………………………………………………………………. ……………………………………………………………………………………………….

(g) The oscilloscope is detached from the concrete slab and connected to an alternating current (a.c.) generator, as shown below.