Given that v, f and λ are the velocity, frequency and wavelength of a wave respectively. Which of the following equations is correct?
v = f2λ
f = vλ
f = vλ2
λ=fv2
Correct answer is B
No explanation has been provided for this answer.
A pressurized perfume bottle is left on the window pane of a room. What happens to he gas molecules of the perfume on a sunny day? They
expand
collide less often
move more rapidly
contract
Correct answer is C
Which of the following statements is correct about the effect of dissolved salt on the freezing point of water?
the freezing point is lowered
the freezing point is increased
there is no change in the freezing point
the change in the freezing point depends on the temperature of the surrounding
Correct answer is A
The continuous stirring in the method of mixtures to determine the specific thermal capacity of a substance ensures
continuous dissipation of heat to the room
uniform distribution of thermal energy to all parts of the mixture
that the thermal energy is confined to the mixture
that there is rapid heat exchange
A mercury-in-glass thermometer read 4cm at ice point and 29cm at steam point. Calculate the temperature when the mercury level is at 9cm
13oC
20oC
33oC
38oC
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