Electricity
A __________________ is a circuit with only one path for current to follow.
A(n) _________ can be used to change the voltage of an alternating current.
transformer
What's the name of a cell that converts radiant energy to electrical energy?
Photovoltaic (solar) cell
Which type of waves has points, called nodes, that do not move?
What does a sound's frequency most influence?
a) pitch
b) amplitude
c) intensity
d) energy
a) pitch
An accumulation of excess electric charge is __________________
static electricity
A(n) ___________ is the region where the magnetic field of a magnet is strongest
magnetic pole
What's the name of the energy that makes use of thermal energy inside the earth?
Which part of a longitudinal wave has the lowest density?
rarefaction
Through which medium does sound travel fastest?
a) empty space
b) liquids
c) gases
d) solids
solids
The electric force that makes charge flow in a circuit is related to the ____________
voltage difference
What is the name of the current that does not change direction?
Direct current
Special caution should be taken in disposing of radioactive materials such as _________
nuclear waste
What can occur when a wave passes from one medium into another?
refraction
Which statement is true about a sound of 65 decibels?
a) It causes intense pain
b) It can cause permanent hearing loss
c) it cannot be heard by anyone
d) It can be heard without discomfort or damage
d) It can be heard without discomfort or damage
Which is an electric conductor?
a) glass
b) wood
c) gold
d) plastic
gold
The properties and interactions of magnets are called ________________
magnetism
To generate electric current, nuclear power plants produce which of the following?
a) steam
b) carbon dioxide
c) plutonium
d) water
a) steam
Calculate the wavelength of a wave traveling on a spring when the wave travels at 0.2 m/s and has a period of 0.5 s?
0.2 m/s x 0.5 s = 0.1 m
Which sound wave property is most related to loudness?
a) wavelength
b) amplitude
c) frequency
d) wavespeed
b) amplitude
A commonly used unit for electrical energy is the
a) kilowatt-hour
b) ampere
c) ohm
d) newton
a) kilowatt hour
Which is not part of a generator?
a) wire coil
b) magnet
c) turbine
d) battery
d) battery
Which of the following is the source of almost all of Earth's energy resources?
a) plants
b) the Sun
c) magma
d) fossil fuels
Which term describes the bending of a wave around an object?
a) refraction
b) interference
c) diffraction
d) reflection
c) diffraction
Two instruments produce 2 Hz beats when played simulataneously. Which might be the frequencies of the notes from the instrument?
a) 1 Hz and 10 Hz
b) 260 Hz and 262 Hz
c) 330 Hz and 330 Hz
d) 440 Hz and 441 Hz
b) 260 Hz and 262 Hz