Waves - Jamb Physics Past Questions and Answers

Question 56:

• JAMB 2000

A transverse wave is applied to a string whose mass per unit length is 3 x 10^-2kgm^-1. If the string is under a tension 12N, the speed of the propagation of the wave is

A. 5 ms^-1
B. 20 ms^-1
C. 30 ms^-1
D. 40 ms^-1

Question 57:

• JAMB 2001

A plane sound wave of frequency 85.5Hz and velocity 342ms^-1 is reflected from a vertical wall. At what distance from the wall does the wave have antinode?

A. 2m
B. 4m
C. 1m
D. 3m

Question 58:

• JAMB 2001

A string is fastened tightly between two walls 24cm apart. The wavelength of the second overtone is

A. 24cm
B. 16cm
C. 12cm
D. 8cm

Question 59:

• JAMB 2001

Find the frequencies of the first three harmonics of a piano string of length 1.5m, if the velocity of the wave on the string is 120ms^-1

A. 40Hz, 80Hz, 120Hz
B. 80Hz, 160Hz, 240Hz
C. 180Hz, 360Hz, 540Hz
D. 369Hz, 180Hz, 90Hz

Question 60:

• JAMB 2002

Which of the following is a characteristics of stationary waves?

A. They are formed by two identical waves travelling in opposite directions
B. They can be transverse or longitudinal
C. The distance between two successive nodes is one wavelenght
D. The antinode is a point of minimum displacement