A cargo ship is loaded into sea water to maximum capacity. What will happen if this ship is moved to river water? Give a reason for your answer?
A body of mass 100 g is floating in water. What will be it’s apparent weight? Justify your answer.
The diagram given below shows an object O and its image I. Copy the diagram and draw suitable rays to locate the lens and its focus. Name the type if lens in this case.
i) State Snell’s law.
ii) Calculate the velocity of light in a glass block of refractive index 1.5. ( Velocity of light in air = 3 x 108 m/s.
i)
The Snell’s law states that the sine of angle of incidence bears a constant ration with sine of the angle of refraction for a pair of media. This constant ratio is called the refractive index of the second medium with respect to the first medium.
ii)
Refractive Index,
This implies,
i) Give one difference between a chemical change and nuclear change.
ii) How is a cathode ray tube used to convert an electrical signal into a visual signal?