From Tungston
From lead
Aluminium
From copper
The filament of an electric lamp becomes white hot but the lead-in wires holding the filament are only slightly heated because they
The filament of electric bulb is made up of:
The final image in a simple microscope is
The first step to getting output from a laser is to excite an active medium. What is this process called?
The flow of thermal energy is called
The flying of birds is a proof of Newtons
The focal length of a concave mirror with a radius of curvature of 20.0 cm is
The focal length of a lens is 50 centimetre. Its power is
The focal length of the lens in a photographic camera is 5 cm. What is the power of the lens?
The following is measured in tonne of oil equivalent (toe) ?
