Dead Scientists
Merely Dead Scientists
Sincerely Dead Scientists
Who Are You Calling an Isotope!?
For You, No Charge...or Maybe Some Charge
Waving Hello
100
Did his experiments with oil drops.
Millikan
100
He used gold foil for his experiments
Rutherford
100
His experiments involved a cathode ray tube.
Thomson
100
The particle(s) found in the nucleus is/are the _____
protons and neutrons
100
The positively-charged particle found in the nucleus is the ____.
proton
100
Frequency is measured in
Hz=1/s=s-1
200
Thomson measured the ____at which an electron beam was bent by a magnet.
angle
200
Millikan determined the ____ of a single electron.
charge
200
_____dropped electrically charged oil drops between plates at different voltages and adjusted the voltage between the plates until the drops floated.
Millikan
200
Forms of the same element that differ only by the number of neutrons are called
isotopes
200
The particle found outside the nucleus in the _____ cloud is the _____.
electron, electron
200
What measurement is shown in the picture below?
wavelength
300
_____shot alpha particles at gold foil to discover the atomic nucleus.
Rutherford
300
The positively-charged particles shot in the gold foil were helium nuclei, also called _____particles.
alpha
300
Most of the positive particles in the gold foil experiment went straight through the foil, which meant that _____?
An atom is mostly empty space
300
The number of protons in bismuth-209
83
300
Protons and neutrons have roughly the same mass of _____u. Electrons have a mass of about _____u.
1 u, 1/1837 u
300
What is the wavelength of an electromagnetic wave with a frequency of 485 Hz?
618556.701 m = 6.18556701 X 105 m
400
In the cathode ray tube experiment, the higher the charge, the ____the beam was bent.
more
400
In the cathode ray tube experiment, the higher the mass, the_____the beam was bent.
less
400
A few of the positive particles in the gold foil were deflected by a ____, _____, _____-_____ nucleus.
small, dense, positively-charged
400
The number of electrons in gallium-70
31
400
Protons and neutrons are held together in the nucleus by _____ _____.
nuclear force
400
What is the energy of an electromagnetic wave with a frequency of 485 Hz?
3.21361×10−31 J
500
What was J.J. Thomson able to determine from his experiment?
He was able to calculate the charge-to-mass ratio of an electron.
500
When plates at different voltages were adjusted to allow electrically charged oil drops between them to float, the force up from _____ was equal to the force down due to _____.
electricity, gravity
500
What does the animation pictured below show about cathode rays?
It shows that cathode rays (electrons) are negatively-charged because they bend toward the positive side and away from the negative side.
500
The number of neutrons in cesium-133.
78
500
Electrons are held into the atom by____.
electrical attraction to the positive nucleus.
500
What is the wavelength of an electromagnetic wave with an energy of 2.53 X 10-19 J?
7.856916996 X 10-7 m = 785.6916996 nm