Physics Past Questions

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2421

Radio waves travel in air at 3.0 x 10⁸ms^-1. If the waves enter water of refractive index \(\frac{4}{3}\), calculate the speed of radio waves in water

A. 4.33 x 10⁸ms^-1
B. 4.00 x 10⁸ms^-1
C. 2.25 x 10⁸ms^-1
D. 1.33 x 10⁸ms^-1

View Answer & Discuss (5) WAEC 2005

2422

The amplitude of a wave is the

A. distance travelled by the wave in a complete cycle of its motion
B. maximum diplacement of the wave particle from the equilibrum position
C. separation of two adjacent particles vibrating in a phase
D. distance between two successive troughs of the wave

View Answer & Discuss WAEC 2005

2423

Which of the following optical instruments does not depend on the use of plane mirrors?

A. kaleidoscope
B. simple microscope
C. sextant
D. simple periscope

View Answer & Discuss (1) WAEC 2005

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2424

A ray of light is incident normally on a plan mirror. If the incident ray is kept fixed while the mirror is rotated through an angle of 30^o, determine the initial and final angles of reflection respectively