Physics Gr.10 T2 sound waves, electromagnetic radiation, magnetism, electrostatics

Question 1

What are longitudinal waves?

Answer 1

Particles in a medium oscillate in directions parallel to the direction that the wave is traveling.

Question 2

What are sound waves?

Answer 2

Longitudinal waves that result from the vibration of objects (pressure waves).

Question 3

What do sound waves travel best through?

Solids
Liquids
Gases

Answer 3

Solids

Question 4

On what can sound waves be shown?

Answer 4

An oscilloscope

Question 5

What is pitch?

Answer 5

How high or low a note is

Question 6

What is loudness?

Answer 6

Amplitude is a measure of the pressure changes

Question 7

What is the audible range?

Answer 7

20 Hz-20 000 Hz

Question 8

What is a musical note?

Answer 8

Sound caused by regular vibrations

Question 9

What is noise?

Answer 9

Irregular vibrations with a mixture of different frequencies.

Question 10

What is ultrasound?

Answer 10

“Beyond” sound

Question 11

Why does electromagnetic radiation have wave particle duality?

Answer 11

Sometimes behaves like a wave and sometimes behaves like a particle.

Question 12

What is the origin of electromagnetic radiation?

Answer 12

Charges are accelerated and this causes alternating electric and magnetic fields, which form perpendicular to each other.

Question 13

Which 3 elements are ferromagnetic materials?

Answer 13

Cobalt (Co)
Nickel (Ni)
Iron (Fe)

Question 14

What is a magnetic field?

Answer 14

A region in the space around a magnet where other magnets will experience a force.

Question 15

What causes magnetic storms?

Answer 15

The distortion of the earth’s magnetic field by solar winds of charged particles.

Question 16

What causes auroras?

Answer 16

Charged particles in solar winds are trapped in the Earth’s field lines and collide with gases in the ionosphere, causing them to be energized and glow.

Question 17

What is an insulator?

Answer 17

An object that is charged by rubbing. Charges accumulate on the surface. Charges are not free to move.

Question 18

What is a conductor?

Answer 18

An object where charges are mobile.

Question 19

What is polarisation?

Answer 19

To make charges on a neutral object separate by bringing a charged object closer.

Question 20

What is the symbol and unit of electric charge?

Answer 20

Symbol: Q
Unit: C (coulomb)

Question 21

What is the name of this formula?

Q+Q
   1   2 Q=➖➖
     2

Answer 21

Th law of conservation of charge.

Question 22

What is the name of this formula?

Q=nq
e

Answer 22

the principle of quantisation

Question 23

What is the magnitude of a charge?

Answer 23

-19

1,6x10 C

Question 24

What is the law of electric charge?

Answer 24

The net charge of an isolated system remains constant during any physical process.

Question 25

What formula is the law of conservation of charge?

Answer 25

Q+Q
1 2
Q=➖➖
2

Question 27

What formula is the principle of quantisation?

Answer 27

Q=nq

e

Question 28

What are the 2 stages of these waves called?

1) transverse wave
2) longitudinal wave

Answer 28

1) crest and trough

2) compression and rarefaction