Electromagnetic Waves Flashcards
All electromagnetic waves travel at the same speed in a vacuum, which is the speed of light.
true
The energy transported by electromagnetic waves is called electromagnetic
radiation
Electromagnetic waves consist of _____ electric and magnetic fields.
oscillating
All electromagnetic waves are produced by _____ charged particles.
accelerating
Which of the following is not a component of the electromagnetic spectrum?
sound waves
Which type of electromagnetic radiation has the shortest wavelength?
gamma rays
Higher frequencies of electromagnetic radiation have -
more energy
Which portion of the electromagnetic spectrum is used in a microscope?
visible light
Which type of electromagnetic radiation has the lowest frequency?
radio waves
Which portion of the electromagnetic spectrum is used to identify fluorescent minerals?
ultraviolet light
This diagram depicts iron filings sprinkled around three permanent magnets. Pole R is the same pole as
x and z
A ________________ is a region in which the magnetic fields of atoms are grouped together and aligned (pointing in the same direction).
magnetic domain
Magnetism occurs when electrons -
spin in the same direction
According to this image A must be
pole and B must be pole?
south, north
Which of the figures below, will attract one another?
All except south south north north
Which of the following statements correctly describes the behavior of magnets?
Like poles repel each other, and unlike poles attract each other.
Compasses are used for navigation. The needle of a compass is always aligned according to Earth’s ______________.
magnetic field
When you break a magnet in half, how many poles does each piece have?
2
Two bar magnets are to be cut in half along the dotted lines shown. None of the pieces are rotated. After the cut:
The two halves of the top magnet will attract, the two halves of the bottom magnet will repel
Magnetism is a consequence of ____________ force.
electromagnetic
How is the direction of a magnetic field defined at any location?
the direction toward which the north pole of a compass needle points
open circle points
out of the screen
x circle points
into the screen
A _________ is a machine that converts electrical energy into mechanical energy.
motor
A _________ is a machine that converts mechanical energy into electrical energy.
generator
A __________ is a device that increases or decreases the emf (electromotive force, or voltage) of alternating current.
transformer
