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2131

Calculate he wavelength of a note which is one octave lower than a note of 256Hz in a medium in which the speed of sound is 352ms^-1

A. 0.69m
B. 1.38m
C. 2.75m
D. 5.50m
E. 9.30m

View Answer & Discuss (5) WAEC 1998

2132

Which of the following are both mechanical and transverse?

A. infra-red rays
B. gamma rays
C. sound waves
D. water waves
E. micro waves

View Answer & Discuss WAEC 1998

2133

An electromagnetic wave of frequency 5.0 x 10¹⁴Hz, is incident on the surface of water of refractive index \(\frac{4}{3}\). Taking the speed of the wave in air as 3.0 x 10⁸ms^-1, calculate the wavelength of the wave in water.

A. 2.2 x 10^-6m
B. 1.7 x 10^-7m
C. 8.0 x 10^-7m
D. 6.0 x 10^-7m
E. 4.5 x 10^-7m

View Answer & Discuss (5) WAEC 1998

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2134

The gravitational force of the moon is one-sixth that of the earth. If a body weighs 6.0N on the moon. Calculate its weight on the earth

A. 36.0N
B. 12.0N
C. 6.0N
D. 2.0N
E. 1.0N

View Answer & Discuss WAEC 1998

2135

In the electrical method of magnetisation, the polarity of the magnet depends on the

A. amount of current passed
B. direction of current
C. magnetic material used
D. size of the magnetic material
E. orientation of the magnetic material in space

View Answer & Discuss WAEC 1998

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