He is credited with observing that rubbing fur on various substances, such as amber, would cause an attraction between the two, which is now known to be caused by static electricity?

The solids which do not allow the current to pass through them are called

 the observation that many metals emit electrons when light shines upon them

 It is used for super speed flights like Concorde and other army planes.

 _____ is the process by which a higher energy quantum mechanical state of a particle becomes converted to a lower one through the emission of a photon, resulting in the production of light.

Heike Kamerlingh Onnes discoved

When any material loses its resistance for electric current

Electrons emitted in this manner may be called

Super sonic waves are used for detecting _____ in metals.

The _______ of an object quantifies how much light is emitted by it

Enrico Fermi proposed the first theory of

For all materials, there is a certain electrical voltage at which the material will break down and allow current to force its way through

Electrons are only dislodged by the photoelectric effect if light reaches or exceeds a threshold

______waves are used to fuse plastics together.

The wavelength (or equivalently, frequency) of the photon is determined by the _____.

The subject of string theory arose in the late 1960's in an attempt to describe

What is electrical?

The photons of a light beam have a characteristic energy proportional to the frequency of the

This medical device uses ultrasonic waves to see internal organs.

Light consists of electromagnetic radiation of different ______ .

The solids which allow the electric current to pass through them are called

An insulators job is to

Electrons can absorb energy from photons when irradiated, but they usually follow an ______

_____ are part of a spectrum of energy waves that include radio and infra red waves.

In ______ a charged particle emits radiation under incident light.