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Science final exam
Terms in this set (69)
The earliest existing descriptions of electrostatic phenomena were provided by the ?
The work necessary to attract bits of paper to a plastic hair comb is supplied by ?
Two charged objects will electrically attract each other if
One is positive and the other is negative
An electrical charge is usually produced by the removal or addition of ?
Is plastic, concrete, wood, or gold a conductor?
Is rubber, germanium, silicon, or lead a insulator?
What force causes the leaves in an electroscope to repel each other?
The inventor of the lightning rod was ?
Capacitors contain layers of ?
Conductors and insulators
Is opposite the flow of negative charges in a conductor
What current source uses each electron just once?
An electrochemical cell
What source of direct current uses light to produce an electrical potential?
A photovoltaic cell
The unit for electrical potential difference is the ?
A kilowatt-hour is a unit of electrical ?
Two light bulbs are connected in a portion of circuit. One burns out, but the other keeps burning. What kind of arrangement is this section of the circuit?
What is not intended to protect against electrical fires?
Ground-fault circuit interrupters
The ? Were the first people to use magnetic compasses.
Who helped change the study of magnetism from superstition to science?
The microscopic magnetic regions inside a magnet are called ?
What material opposes a magnetic field?
What happens at the Curie temperature of a ferromagnetic material?
The ferromagnetic material behaves as though it were paramagnetic
Devices that convert mechanical energy into electrical energy are called ?
Nuclear energy generation uses what kind of turbine?
Geothermal energy generation uses what kind of turbine?
Does maglev trains, door bells, ac generators, or magnetic compasses not use electromagnets?
Is hearing, a medium, a vibrating object, or particles not necessary for sound to occur?
In which phase of matter does sound generally travel the fastest?
Does sound travel fastest through air, iron, gasoline, or water?
How high or low a tone sounds is called its
Loudness is related to the ? Of a sound wave
Is volume, loudness, pitch, or intensity not a quality of sound?
The unit for the intensity of a sound wave is the ?
What wave phenomenon causes beats to form?
A helicopter approaches, hovers low overhead for a minute, and then flies away. How does the pitch of its blades and engine compare when its hovering overhead to when it was approaching you?
It was softer when hovering
In what part of the human body do vocal sounds originate?
What are the three major sections of the ear?
Outer ear, middle ear, and inner ear
Which part of the ear converts sound into nerve impulses to be sent to the brain?
The inner ear
An amplification system increases the ? Of a sound wave.
What type of technology sends out short pulses of sound and receives them as they are reflected back?
Which of the following cannot produce infrasound?
Infrasonic waves are ? The range of sounds that humans can hear.
Ultrasonic waves are ? the range of sounds that humans can hear.
Which is not an application of ultrasonic waves?
We perceive electromagnetic energy in the visible portion of the EM spectrum as ?
Which of the following is a luminous object?
A light bulb
What key characteristic would the ideal light source have?
A continuous spectrum
What is not an illuminated object?
A light bulb
The measure of the brightness of light at a source is its ?
What do we call the rate at which a light source radiates energy?
Brightness, power, and intensity
What tool measures brightness by measuring the electrical current produced by a photoelectric cell inside it?
What demonstrates diffuse reflection?
A rock face
What demonstrates specular reflection?
The smooth surface of a pond
When a light ray reflects off a surface, the angle of incidence equals the angle of reflection. Which term applies best to that statement?
The law of reflection
What does not use a concave mirror?
A rear view mirror
A searchlight relies on ?
Dispersion involves mostly ?
What results from dispersion?
What would aristotle have considered an element?
Why does alchemy hold some importance for science today?
Alchemists discovered and purified many substances later known to be chemical elements.
Which chemists element symbols are the most similar to those chemists use today?
Which factor is not a source for modern element names?
Size of atom
What element does not naturally occur as a diatomic molecule?
What element does not have a polyatomic molecular form?
Who first recognized groups of three elements with similar physical and chemical properties?
? Declares that properties of elements vary with their atomic numbers in a periodic way.
The periodic law
What most influences the chemical and physical properties of an element?
The electron structure of its atoms
Refer to a periodic table. What type of element is manganese(mg)?
What family is made up of mostly metals?
Which family of all nonmetals is the most reactive?
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