Waves - Jamb Physics Past Questions and Answers

Question 21:

• JAMB 1989

The air column as shown above is set into vibration by the turning fork. In this State of resonance, the waves in the air column will be

A. Stationary and transverse
B. Stationary and longitudinal
C. Progressive and transverse
D. Progressive and longitudinal

Question 22:

• JAMB 1990

A light wave of frequency 5 x 10¹⁴Hz moves through water which has a refractive index of \(\frac{4}{3}\). Calculate the wavelength in water if the velocity of light in air is 3 x 10⁸ms^-1

A. 4.5 x 10^-7m
B. 6.0 x 10^-7m
C. 1.7 x 10⁶m
D. 2.2 x 10⁶m

Question 23:

• JAMB 1990

A wave disturbance travelling in air enters a medium in which its velocity is less than that in air. Which of the following statements is true about the wave medium?

A. Both the frequency of the wave and the wavelength are decreased
B. The frequency of the wave is decreased while the wavelength is increased
C. The frequency of the wave is unaltered while the wavelength is decreased
D. The frequency of the wave is decreased while the wavelength is unaltered

Question 24:

• JAMB 1990

In a resonance tube experiment, the effective length of the air column for the first resonance is 20cm when set into vibration by a tuning fork of frequency 480Hz. Neglecting and effect, the velocity of sound in air is

A. 96ms^-1
B. 255ms^-1
C. 340ms^-1
D. 384ms^-1

Question 25:

• JAMB 1991

Which of the following is TRUE of light and sound waves?

A. They both transmit energy
B. They both need a mediumfor propagation
C. They are both transverse waves
D. Their velocities in air are equal