Waves - Jamb Physics Past Questions and Answers

Question 46:

• JAMB 1998

In a resonance tube experiment, if the fundamental frequency of the vibrating air column is 280Hz, the frequency of the third overtone is

A. 70Hz
B. 840Hz
C. 1120Hz
D. 1960Hz

Question 47:

• JAMB 1999

The equation of a wave travelling along the positive x-direction is given by;
y = 0.25 x 10^-3 sin (500t - 0.025x).
Determine the angular frequency of the wave motion.

A. 0.25 x 10^-3rad s^-1
B. 0.25 x 10^-1rad s^-1
C. 5.00 x 10²rad s^-1
D. 2.50 x 10³rad s^-1

Question 48:

• JAMB 1999

If a sound wave goes from a cold air region to a hot air region, its wavelength will

A. Increase
B. Decrease
C. Decrease then increase
D. Remain constant

Question 49:

• JAMB 1999

The lowest note emitted by a stretched string has a frequency of 40Hz. How many overtones are there between 40hz and 180Hz?

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

Question 50:

• JAMB 1999

Which of the following electromagnetic waves is least energetic?

A. Infra-red rays
B. X-rays
C. Ultra-violet rays
D. Gamma rays