1997 - WAEC Physics Past Questions and Answers - page 2

When white light is incident on a glass prism the spectrum produced on a screen placed beyond the prism is due to?

At what distance from a simple microscope must an object be placed so that the image 5 times the size of the object is produced 20cm from the lens?

Whenever light waves are restricted to a specific plane they are said to be

A solid material of volume 100(cm^{-3}) is heated through a temperature difference of 40°C. Calculate the increase in the volume of the material if its linear expansitivity is 2 x (10^{-6}K{-1})

Calculate the quantity of heat released when 100g of steam at 100°C condenses to water(Take the specific latent heat of vaporization of water as 2.3x (10^6Jkg^{-1}))

A fixed mass of gas occupies a volume of 20(cm^3) at a fixed pressure of 700mmHg. Assuming that the temperature remains constant, what will be the volume of the gas at 750mmHg?

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?

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 material of the cup. (Specific heat capacity of water =4.2J(g^{-1}K^{-2}))((Specific latent heat fusion of water =336J(g^{-1})

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})?

Which of the following statements about kinetic theory of matter is not correct?