Sound Wave Q

Sound Wave Q & A Posted: Sun, 22 Feb 2009 08:00:00 +0000

Q1: SPM2004/P1 The diagram shows an ultrasonic waves transmitted from a boat to the seabed to determine the depth, D, of the sea. The speed of the ultrasonic waves in water is 1 500 m s ‘.The echo of the waves is received 2.0 s after the transmission. What is the value of D? A 375m B 750m C 1500m D 3000m E 6000m ans:C Discussion:

The depth of sea water can be calculated using the formula : 2D = v x t

thus D= (1500 x 2)/ 2 Q2: SPM2003/P1 Ahmad shouts in front of a high wall. He hears the echo of his voice 1.2 seconds later.The velocity of sound in air is 340 m/s.What is the distance between Ahmad and the wall? A 204m B 283m C 340m U 408m E 816m ans:A Discussion: .. like in 2004 almost similar pattern of question came out in 2003. U can apply the same formula 2D

t ( D=distance, v=velocity, t=total time). Q3: SPM2006/P1 Again..the same pattern came out in 2006

=vx

Diagram 21 shows a submarine transmitting ultrasonic waves directed at a big rock on the sea bed. After 10 seconds, the submarine detects the reflected wave.

Calculate the distance of the submarine from the big rock. [Velocity of ultrasonic wave = 1 560m/s] A. 3.9 km B. 7.8 km C. 15.6 km D. 31.2 km E. 156.6 km answer: try this out first.. u can leave a comment to know the answer :).