Relationship between frequency, wavelength and wave velocity - Jamb Physics Past Questions and Answers

Question 6:

• JAMB 1984

Radio waves have a velocity of 3 x 10⁸ms^-1. A radio station sends out a broadcast on a frequency of 800kHz. The wavelength of the broadcast is

A. 375.0m
B. 267.0m
C. 240.0m
D. 37.5m
E. 26.7m

Question 7:

• JAMB 1986

A man clapping his hands at regular intervals observes that the echo of a clap coincides with the next clap. If the reflecting cliff is 160m away and the speed of sound is 320ms^-1, what is the frequency of the clapping?

A. 1 Hz
B. 2Hz
C. 4Hz
D. 8Hz

Question 8:

• JAMB 1987

A wave has a frequency of 2Hz and a wavelength of 30cm. The velocity of the wave is

A. 60.0ms^-1
B. 6.0ms^-1
C. 1.5ms^-1
D. 0.6ms^-1

Question 9:

• JAMB 1988

The fig above shows two waveforms X and Y. If the frequency of X is 30Hz what is the frequency of Y

A. 12Hz
B. 19Hz
C. 60Hz
D. 75Hz

Question 10:

• 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