lesson 3

Question 1

a form of energy that is transmitted through the wires for operating various machines

Answer 1

electricity

Question 2

attractive or repulsive force that acts up to a certain distance

Answer 2

magnetism

Question 3

he proved the direct like between electric and magnetic phenomena

Answer 3

hans oersted

Question 4

electric current cannot be induced in a circuit merely by the presence of a magnetic field

Answer 4

faradays experiment

Question 5

a form of energy or the flow of electrons

Answer 5

electricity

Question 6

study of stationary electric charges

Answer 6

electrostatic

Question 6

study of electrostatic charges in motion

Answer 6

electrodynamics

Question 7

lodestone or magnetite in the earth exhibits strong magnetism

Answer 7

naturally occurring magnets

Question 8

they are produced by charging them in a field of electromagnet

Answer 8

artificially induced permanent magnets

Question 9

when an electric current is conducted through the wire, a magnetic field is created

Answer 9

electromagnets

Question 10

made from coils of superconducting wire. it is cooled to a cryogenic temperature 10 kelvin = -263 C by liquid helium or nitrogen

Answer 10

superconducting magnets

Question 11

three classification of matter according to interaction with magnetism

Answer 11

1. dimagnetic material - unaffected to magnetic field
2. ferromagnetic materials - strongly attracted by magnet
3. paramagnetic materials - slightly attracted to magnet

Question 12

battery known as voltic pile

Answer 12

alessandro volta

Question 13

first one too link electricity and magnetism

Answer 13

hans oersted

Question 14

develop the laws of electromagnetic induction

Answer 14

Michael faraday

Question 15

develop the incandescent bulb

Answer 15

thomas edison

Question 16

develop the alternating current

Answer 16

nikola tesla

Question 17

adopting the alternating current for electric power transmission

Answer 17

george westinghouse

Question 18

study of electromagnetic force

Answer 18

electromagnetism

Question 19

radiation capable of removing electrons from the orbital shell

Answer 19

ionizing radiation

Question 20

radiation not capable of removing electrons from the orbital shell

Answer 20

non-ionizing radiation

Question 21

process of removal of electrons from the orbital of an atom

Answer 21

ionizing

Question 22

temporary removal of electrons

Answer 22

excitation

Question 23

produced outside the nucleus

Answer 23

xray

Question 24

produced inside the nucleus

Answer 24

gamma ray

Question 25

types of EM radiation according to its wavelength

Answer 25

gamma ray
xray
ultraviolet ray
visible light
infrared ray
microwave
radio wave

Question 26

distance between two succeeding wave crests

Answer 26

wavelength

Question 27

block by paper

Answer 27

alpha

Question 28

block by thin plate made of wood, aluminum

Answer 28

beta

Question 29

block by lead, iron, and other thick metal plates

Answer 29

xray and gamma ray

Question 30

block by water and concrete

Answer 30

neutron

Question 31

● ionizing radiation
● with mass and/or charge
● travels at the speed of light in free space
● originate in the nucleus of an atom
● exs. alpha, beta and neutron particles

Answer 31

PARTICULATE RADIATION

Question 32

● some are ionizing others are
non-ionizing radiation
● no mass and/or charge
● radiation in the form of waves but
behaves like a photon(particles)
● travels at the speed of light in free
space.

Answer 32

NON-PARTICULATE
RADIATION/ELECTROMAGNETIC RADIATION

Question 33

Speed of light in free space

Answer 33

= c
= 186, 282 miles/second
= 300,000 km/sec
= 3 X 10 8 m/sec