1997
What is the frequency of a radio wave of wavelength 150m if the velocity of radio waves in free space is 3 x \(10^8ms^{-1}\)?
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1997 WAEC SSCE Physics Past Questions
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1997
A cup containing 100g of pure water at 20°C is placed in a refrigerator. If the refrigerator extracts heat at a rate of 840J per minute, calculate the time taken for the water to freeze. Neglect the heat capacity of the…
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1997
A converging lens of focal length 15cm is used to obtain a real image magnified \(1\frac{1}{2}\) times. Calculate the distance of the image from the lens?
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1997
The odor of a leaking gas is perceived at a distance from the source. This is made possible by the process of
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1997
The half-life of a radioactive material is 6hrs. What quantity of 1kg of the material would decay in 24 hours?
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1997
When a paint brush is removed from clean water, the bristles of the brush are pulled together because of
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1997
Which of the following statements is not true of nuclear fission?
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1997
The ratio of tensile stress to tensile strain is known as
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1997
Two identical waves traveling in the same direction are superimposed. What should be the phase difference between the waves for maximum destructive interference to occur?
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1997
In a photocell, light energy is converted to
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1997
The current in the primary coil of a transformer is 2.5A. If the coil has 50 turns and the secondary 250 turns, calculate the current in the secondary coil. Neglect energy losses in the transformer
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1997
The relationship between the directions of magnetic field, the current-carrying wire in the field is easily remembered using
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1997
Lenz’s law of electromagnetic induction is essentially a statement of the
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1997
An alternating current with a peak value of 5A passes through a resistor of resistance 10Ω. Calculate the rate at which energy is dissipated in the resistor
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1997
A progressive wave has a wavelength of 50cm. calculate the phase difference between two points at a distance of 20cm apart.
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1997
Which of the following statements is not correct?
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1997
A pipe open at both ends, produces a fundamental note. If the velocity of sound in air is V and L the length of the pipe, which of the following expresses the frequency of the note? Neglect end correction
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1997
When a resistor of resistance R is connected across a cell, the terminal p.d of the cell is reduced to three quarters of its e.m.f. The internal resistance of the cell is expressed as
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1997
The current in a series R-L-C circuit attains its maximum value when the
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1997
The magnification produced with a converging lens is 5. If the object is a square wire gauze of side 2cm, calculate the area of the image
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