Physics Quiz 6

Guglielmo Marconi sent out the first wireless signals in 1897. Max Planck unveiled the Quantum Theory in 1900. Wright Brothers successfully flew an aircraft in 1903. Albert Einstein propounded the General Theory of Relativity in 1915.

Metals are good conductors of electricity and heat because the atoms in the metals form a matrix through which outer electrons can move freely.

Sonar (sound navigation and ranging) is an equipment or a system for finding objects underwater using sound waves.

Bats navigate and find insect prey using echolocation. They produce ultrasound. The sound waves emitted by bats bounce off objects in their environment. Then, the sounds return to the bats' ears, which are finely tuned to recognize their own unique calls.

An electron microscope is a microscope that uses a beam of accelerated electrons as a source of illumination. It was invented by Ernst Ruska (physicist) and Max Knoll (electrical engineer), from the University of Berlin in 1931.

Teletext is a standard for displaying text and graphics on the TV screen. Teletext sends data in the broadcast signal, hidden in the invisible vertical blanking interval area at the top and bottom of the screen.

A rocket works on the principle of conservation of linear momentum. Rocket ejaculates gases in backward direction which creates momentum of the gases backward and thus by conservation of momentum, the rocket gets momentum in the forward direction making it move forward.

Aperture refers to the opening of a lens's diaphragm through which light passes. It controls the brightness of the image that passes through the lens and falls on the image sensor. The camera sensor size is one of the key elements that affect the sharpness of an image.

Mesons are hadronic subatomic particles composed of an equal number of quarks and antiquarks, usually one of each, bound together by strong interactions. Outside the nucleus, mesons appear in nature only as short-lived products of very high-energy collisions between particles made of quarks, such as cosmic rays (high-energy protons and neutrons) and baryonic matter.

Temperature does not affect speed of light. Light is an electromagnetic wave and does not need any material medium to propagate.