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83 Cards in this Set

  • Front
  • Back
Strip electrons from an atom and the atom becomes
positive ion
To say that electric charge is conserved means that no case has ever been found where the
net charge has been created or destroyed
A conductor differs from an insulator in that a conductor
who knows
Charge carriers in a metal are electrons rather than protons because electrons are
loosely bound
Electrons are made to flow in a wire when there is
a potential difference across its ends
A wire that carries an electric current
may be electrically charged
Charge flows in a
closed circuit
A wire carrying a current is normally charged
not at all
The primary source of electrons in an ordinary electrical circuit is
the electrical circuit itself
Alternating current is normally produced by a
In a simple circuit containing a bulb, energy is given to the moving charges by
a generator
A positive ion has more
protons than electrons
Moving electric charges will interact with
an electric field or a magnetic field
Like kinds of magnetic poles repel while unlike kinds of magnetic poles
An iron nail is more strongly attracted to the
north or south pole - no difference
Magnetic field lines about a current-carrying wire
circle the wire in closed loops
If we think of the Earth as a magnet, its north (-seeking) pole is nearest
Which pole of a compass needle points to a south pole of a magnet?
north pole
Outside a magnet, magnetic field lines are conventionally drawn from
north to south
When a bar magnet is broken in two, each half is
as magnetic as the original magnet
Thrust a magnet into a coil of wire and the coil
has a current in it
In an electrically neutral atom the number of protons in the nucleus is equal to the number of
electrons that surround the nucleus
To say that electric charge is quantized is to say that the charge on an object
is a whole-number multiple of the charge of one electron
To say that electric charge is conserved is to say that electric charge
can neither be created nor destroyed
Rub electrons from your hair with a comb and the comb becomes
negatively charged
An electron and a proton
attract each other
If you comb your hair and the comb becomes positively charged, then your hair become
negatively charged
A balloon will stick to a wooden wall if the balloon is charged
either positively or negatively
The magnetic field strength inside a current-carrying coil will be greater if the coil encloses a
rod of iron
A device that transforms electrical energy to mechanical energy is a
When a bar magnet is thrust into a coil of copper wire, the coil tends to
repel the magnet as it enters
A device that transforms mechanical energy into electrical energy is a
a generator
Electromagnetic induction occurs in a coil when there is a change in
magnetic field intensity in the coil
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 particle 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 and isotopes of the same element
The atomic number of an element is the same as the number of its
Different isotopes of an element have different numbers of
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
The half life of an isotope is one day. At the end of three days, how much of the isotope remains?
one eighth
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
a miniature solar system
We now consider the Bohr model of the atom to be
defective and oversimplified but useful
Compared to the average diameter of a hydrogen atom, the average diameter of a helium atom is
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?
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
Which of these electromagentic waves has the shortest wavelength?
When visible light is incident upon clear glass, atoms in the glass
are forced into vibration
Infrared waves are often called heat waves because they
induce resonance in molecules and increase internal energy in a substance
Sunburns are produced by
ultraviolet light
Which of the following can not travel a vacuum?
a sound wave
A pair of sunglasses and a pair of reading glasses are left in the sunlight. The hotter glasses would be the
The color of an opaque object is the same as the light that is
What color light is transmitted by a piece of blue glass?
Complimentary colors are two colors that
produce white light when added together
Different colors of light correspond to different light
A mixture of cyan and yellow pigments appears
The sky is blue because air molecules in the sky act as tiny
resonators which scatter blue light
Red sunsets are due to lower frequencies of light that
survive being scattered in the air
The greenish blue of water is evidence for the
absorption of red light
According to Huygen's Principle, every point on a wave
behaves as a source of new waves
Polarization is a property of
transverse waves
Light will not pass through a pair of polaroids when their aces are
Monochromatic light is light of a single
wavelength, frequency, and color
Light from a lit match comes from
Light is emitted when an electron
makes a transition to a lower energy level
Compared to the energy put into a laser, the energy of the laser beam is
In the process of fluorescence, part of the input energy immediately
becomes internal energy and the rest lower frequency light
Light from a laser is
monochromatic, in phase, and coherent
A watch dial that continues to glow after a week in the dark is almost certainly
The size of the pupil of your eye depends on
your mood and the brightness of the room