Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
25 Cards in this Set
- Front
- Back
|
When Rutherford had a stream of alpha particles hit a gold foil, most of the particles
|
went almost straight through
|
|
|
X-rays are similar to
|
gamma rays
|
|
|
Which radiation has no electric charge associated with it?
|
gamma rays
|
|
|
Both X-rays and gamma rays are emitted from
|
different parts of the atom
|
|
|
The sources of Xrays and gamma rays, respectively, are
|
electron clouds and the atomic nucleus
|
|
|
A nucleon is either
|
a proton or a neutron
|
|
|
Once an alpha partile is outside the nucleus it is
|
electrostatically repelled
|
|
|
An atom with an imbalance of electrons to protons is
|
an ion
|
|
|
Deuterium and tritium are both
|
forms of hydrogen
isotopes of the same element both of these |
|
|
The atomic number of an element is the same as the number of its
|
protons
|
|
|
Different isotopes of an element have different numbers of
|
neutrons
|
|
|
Most alpha particles fired at a gold foil passthrough undeflected because the
|
atoms of gold, like any other atoms, are mostly empty space
|
|
|
Generally speaking, the larger a nucleus is, the greater its
|
instability
|
|
|
The half life of an isotope is one day. At the end of three days, how much of the isotope remains?
|
one eight
|
|
|
According to Niels Bohr, an electron in an excited state could give off
|
several photons in a series of transitions to the ground state
|
|
|
The Bohr model of the atom is similar to
|
miniature solar system
|
|
|
We now consider the Bohr model of the atom to be
|
defective and oversimplified but still useful
|
|
|
Compared to the average diameter of a hydrogen atom, the average diameter of a helium atom is
|
smaller
|
|
|
Heavy atoms are not appreciably larger in size than light atoms because the nuclei of heavy atoms have more
|
electric charge
|
|
|
What is it that electrons have that protons always have in equal magnitude?
|
charge
|
|
|
X-rays may be regarded as
|
high frequency radio waves
|
|
|
In the Heliocentric World System
|
the Sun is at the center of the universe and planets revolve around it.
|
|
|
According to Newton, gravitation is
|
a universal attractive force.
|
|
|
According to the Big Bang Model,
|
the universe is expanding.
|
|
|
Dark Energy is thought to be
|
the cause of the acceleration of the universe.
|
