The electron

List two properties of an electron.

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____________ named the electron and ____________ measured its charge.

(Surnames only: Newton & Einstein)

Define Thermionic Emission

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Cathode Ray Tube: Where are the electrons released from?

• cold metal cathode

• hot metal cathode

• cold metal anode

• hot metal anode

List the properties of cathode rays.

• - deflected by electric and magnetic fields

• - cause substances to fluoresce (used to detect them)

• - have kinetic energy

• - travel in straight lines

• - can produce x-rays when they strike a metal target

What equation gives the potential energy of the electrons in a field?

• E = hf

• E = 1/2 mv²

• W = qV

• E = mcΔΘ

Which equation gives the Kinetic energy of the electrons in an electric field?

• 1/2 mv² = mgh

• mcΔΘ = mgh

• qV = 1/2 mv²

• hf = qV

Define the electronvolt.

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Give two applications of a cathode ray tube.

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Define the photoelectric effect.

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