Question 4666:

An air bubbles rises from the bottom to the top of a water dam which is \(40 \mathrm{~m}\) deep. The volume of the bubble just below the surface is \(2.5 \mathrm{~cm}^{3}\). Find its volume at the bottom of the dam, if atmospheric pressure is equivalent to \(10 \mathrm{~m}\) of water.

A. \(2.0 \mathrm{~cm}^{3}\)
B. \(1.6 \mathrm{~cm}^{3}\)
C. \(0.625 \mathrm{~cm}^{3}\)
D. \(0.5 \mathrm{~cm}^{3}\)

Question 4667:

When equal weights of iron and water are subjected to an equal supply of heat, if is found that the piece of iron becomes much hotter than water after a shorter time because higher than that of water

A. The specific heat of iron is higher than that of water
B. Iron is in solid form
C. Water is in liquid form
D. The specific heat of water is higher than that of iron
E. The specific heat of iron is infinite

Question 4668:

Of two identical tuning forks with natural frequency \(256 \mathrm{~Hz}\), one is loaded so that 4 beats per seconds are heard when they are sounded together. What is the frequency of the loaded tuning fork?

A. \(260 \mathrm{~Hz}\)
B. \(252 \mathrm{~Hz}\)
C. \(248 \mathrm{~Hz}\)
D. \(246 \mathrm{~Hz}\)

Question 4669:

Radio waves have a velocity of \(3 \times 10^{8} \mathrm{~m} / \mathrm{s}\). A radio station sends out a broadcast on a frequency of \(800 \mathrm{KHz}\). The wavelength of the broadcast is ____________

A. \(240.0 \mathrm{~m}\)
B. \(267.0 \mathrm{~m}\)
C. \(375.0 \mathrm{~m}\)
D. \(37.5 \mathrm{~m}\)
E. \(26.7 \mathrm{~m}\)

Question 4670:

A narrow beam of white light ca be split up into different colours by a glass prism. The correct explanation is that ____________

A. White light is electromagnetic wave
B. The prism has all the colours of the white light
C. White light has undergone total internal reflection in the prism
D. Different colours of white light travel with different speeds in glass