Physics
(i) Why is the ratio of the velocities of light of wavelengths 4000 Å and 8000 Å in vacuum 1 : 1 ?
(ii) Which of the above wavelengths has a higher frequency?
Related Questions
The power of a lens is –5D.
(i) Find it's focal length.
(ii) Name the type of lens.
State the energy changes in the following cases while in use:
(i) An electric iron.
(ii) A ceiling fan.
The diagram below shows a lever in use:
(i) To which class of levers does it belong?
(ii) Without changing the dimensions of the lever, if the load is shifted towards the fulcrum what happens to the mechanical advantage of the lever?