1989
A string is stretched between two points 50cm apart. It is then plucked at its center and the velocity of the wave produced is 300m/s. Calculate the number of vibrations made by the string in 1s.
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1989 WAEC SSCE Physics Past Questions
1989
A sound pulse sent vertically downwards into the earth is reflected from two different layers of the earth such that echoes are heard 1.2s and 1.4s. Assuming speed of the pulse is 2000ms-1, calculate the distance between…
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1989
The distance between a node and an anti-node for a transverse wave is equal to
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1989
The electric force between two point charges each of the magnitude, q at a distance of r apart in air of permittivity is:
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1989
Calculate the escape velocity for a rocket fired from the earth's surface at a point where the acceleration due to gravity is 10ms-2 and the radius of the earth is 6 x 106m.
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1989
What is the gravitational potential due to a molecule of mass, m and at a distance, r from it? (G = gravitational constant).
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1989
Which of the following is not a property of longitudinal waves?
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1989
Which of the following is a derived unit?
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1989
Which of the following instruments can be used to compare the relative magnitude of similar charges on two given bodies?
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1989
A short chain is usually attached to the back of a petrol tanker and trailing behind it so that the
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1989
The maximum displacement on either side of the equilibrium position of an object in simple harmonic motion represents
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1989
In the clinical thermometer, the function of the kink is to i. Prevent the back flow of mercury after use. ii. Ensure the back flow of mercury after use. iii. Maintain the thermometric property of mercury. iv. Allow…
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1989
Which of the transitions will produce the emission of highest frequency?
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1989
Which of the following is a stringed instrument?
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1989
(a)(i) Explain the terms: photoelectric emission and threshold frequency; (ii) Einstein's photoelectric equation can be written as \(E = hf - hf_{o}\) What does each of the symbols used in the equation above represent?(b…
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1989
(a) State the laws of electromagnetic induction.(b) (i) Describe a simple experiment to show how an induced e.m.f, can be produced; (ii) State two factors on which the magnitude of the induced e.m.f. depends(c) Explain w…
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1989
(a) What is a wave motion?The equation \(y = A \sin \frac{2\pi}{\lambda} (Vt-X)\) represents a wavetrain in which y is the vertical displacement of a particle at distance X from the origin in the medium through which the…
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1989
(a) What is meant by the statement: The linear expansivity of a solid is \(1.0 \times 10^{-5}K^{-1}\)?(b)(i) Describe an experiment to determine the linear expansivity of a steel rod. (ii) Steel bars, each of length 3m a…
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