Electromagnetic Waves

Question 1

All electromagnetic waves travel at the same speed in a vacuum, which is the speed of light.

Answer 1

true

Question 2

The energy transported by electromagnetic waves is called electromagnetic

Answer 2

radiation

Question 3

Electromagnetic waves consist of _____ electric and magnetic fields.

Answer 3

oscillating

Question 4

All electromagnetic waves are produced by _____ charged particles.

Answer 4

accelerating

Question 5

Which of the following is not a component of the electromagnetic spectrum?

Answer 5

sound waves

Question 6

Which type of electromagnetic radiation has the shortest wavelength?

Answer 6

gamma rays

Question 7

Higher frequencies of electromagnetic radiation have -

Answer 7

more energy

Question 8

Which portion of the electromagnetic spectrum is used in a microscope?

Answer 8

visible light

Question 9

Which type of electromagnetic radiation has the lowest frequency?

Answer 9

radio waves

Question 10

Which portion of the electromagnetic spectrum is used to identify fluorescent minerals?

Answer 10

ultraviolet light

Question 11

This diagram depicts iron filings sprinkled around three permanent magnets. Pole R is the same pole as

Answer 11

x and z

Question 12

A ________________ is a region in which the magnetic fields of atoms are grouped together and aligned (pointing in the same direction).

Answer 12

magnetic domain

Question 13

Magnetism occurs when electrons -

Answer 13

spin in the same direction

Question 14

According to this image A must be
pole and B must be pole?

Answer 14

south, north

Question 15

Which of the figures below, will attract one another?

Answer 15

All except south south north north

Question 16

Which of the following statements correctly describes the behavior of magnets?

Answer 16

Like poles repel each other, and unlike poles attract each other.

Question 17

Compasses are used for navigation. The needle of a compass is always aligned according to Earth’s ______________.

Answer 17

magnetic field

Question 18

When you break a magnet in half, how many poles does each piece have?

Answer 18

2

Question 19

Two bar magnets are to be cut in half along the dotted lines shown. None of the pieces are rotated. After the cut:

Answer 19

The two halves of the top magnet will attract, the two halves of the bottom magnet will repel

Question 20

Magnetism is a consequence of ____________ force.

Answer 20

electromagnetic

Question 21

How is the direction of a magnetic field defined at any location?

Answer 21

the direction toward which the north pole of a compass needle points

Question 22

open circle points

Answer 22

out of the screen

Question 23

x circle points

Answer 23

into the screen

Question 24

A _________ is a machine that converts electrical energy into mechanical energy.

Answer 24

motor

Question 25

A _________ is a machine that converts mechanical energy into electrical energy.

Answer 25

generator

Question 26

A __________ is a device that increases or decreases the emf (electromotive force, or voltage) of alternating current.

Answer 26

transformer