science and inventions 2
Terms
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- 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.