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100
What is a cathode ray?
A ray of radiation
100
What next significant development came in 1909?
The mass of the electron
100
Who was born in New Zealand and attended school at Cambridge University in England?
Ernest Rutherford
100
How are the electrons held within an atom?
By their attraction to the positively charged nucleus
100
What did Albert Einstein propose in 1905?
That the electromagnetic radiation has both wavelike particle-like natures
200
who created the cathode ray?
William Crookes
200
Who determined the charge of an electron?
Robert Millikan
200
In 1911 what did Rutherford become interested in?
How positively charged particles charged alpha particles interacted with solid matter
200
huge;bigger
The volume of space through which the electrons move is bigger or smaller compared to the volume of the nucleus?
200
A photon
What is a particle of electromagnetic radiation with no mass and carries a quantum of energy?
300
What helped J.J Thomson to discover that atoms were divisible into smaller subatomic particles?
The cathode ray
300
What did he discover next?
The mass of a single electron
300
What experiment did Rutherford and a small group of scientist conduct?
They conducted an experiment to see if alpha particles would be deflected as they passed through a thin foil of gold
300
Approximately how many times more is a typical atom's diameter defined by the volume of space to the diameter of the nucleus?
10 000
300
What is a photon also called?
A stream of tiny particles or bundles of energy
400
Did scientists believe his new discovery?
No
400
What did he need to know to determine the electron's mass?
The electron's charge and the known charge-to-mass ratio
400
What did the scientists discover?
That some of the alpha particles were deflected at very large angles
400
What explains the deflection of alpha particles?
The concentration positive charge in the nucleus
400
What did Einstein calculate that photons depended on?
Frequency
500
What was the first subatomic particle Thomson discovered?
The electron
500
Is the mass of the electron big or small?
Small
500
What was determined according to Rutherford's new nuclear model?
That most of an atom consist of electrons moving rapidly through empty space
500
What does the nuclear model explain?
The neutral nature of matter
500
Who proposed that the energy of a photon of light must have a certain minimum or threshold,value to cause the ejection of a photoelectron?
Einstein