Flash cards Physics

Question 1

Transverse Pulse?

Answer 1

A pulse in which the displacement of the particles of the medium is perpendicular to the direction of the movement.

Question 2

Amplitude?

Answer 2

Maximum disturbance of particles from its rest position.

Question 3

Superposition?

Answer 3

Sum of the amplitude of 2 pulses that occupy the same space at the same time

Question 4

Constructive Interference?

Answer 4

Occurs when the crest of 2 pulses meet on the same side of the rest position. Resulting in greater amplitude.

Question 5

Destructive Interference?

Answer 5

Occurs when a crest and trough meet on opposite sides of the rest position.

Question 6

Transverse Wave?

Answer 6

A wave in which the particles of the medium vibrate perpendicular to the direction of motion of the wave.

Question 7

Uses and Disadvantage of Radio Waves?

Answer 7

Radio and TVs
Noise pollution

Question 8

Crest

Answer 8

Highest point of wave.

Question 9

Trough?

Answer 9

Lowest point of wave.

Question 10

Wavelength?

Answer 10

Distance between 2 points in phase.

Question 11

Points In phase?

Answer 11

2 points separated by a whole number of wavelengths.

Question 12

Frequency?

Answer 12

Number of waves per second.

Question 13

Period?

Answer 13

Time taken for 1 wave to pass a point.

Question 14

Wave speed?

Answer 14

Distance traveled by a point on the wave per unit time.

Question 15

Longitudinal Wave?

Answer 15

A wave in which the particles of the medium vibrate parallel to the direction of movement.

Question 16

Compression?

Answer 16

A region of high pressure and particles are close together

Question 17

Rarefaction?

Answer 17

A region of low pressure and particles are far apart.

Question 18

Sound Wave?

Answer 18

Series of consecutive compressions and rarefactions.

Question 19

SONAR?

Answer 19

Sound Navigation and Ranging

Question 20

Photon?

Answer 20

Energy packets in EM waves that transfer energy to particles of matter.

Question 21

Law of Conservation of Charge?

Answer 21

Net charge of an isolated system remains the constant during any physical process.

Question 22

Law of Quantification of Charge?

Answer 22

Every charge consists of a integer multiples of electrons.

Question 23

Use and Disadvantage of Microwaves?

Answer 23

Microwave ovens, communication satellites
Use of cell phone is addictive and affects productivity

Question 24

Use and Disadvantage of Infared?

Answer 24

Keeping food warm, TV remote
Used by poachers for tracking

Question 25

Use and Disadvantage of Visible Light?

Answer 25

Objects reflects light so we can see, photosynthesis No disadvantage

Question 26

Use and Disadvantage of UV?

Answer 26

Sterilisation, prolonged shelf life Can cause damage to eyes, skin or cancer

Question 27

Use and Disadvantage of X-ray?

Answer 27

CT scans, medical images Can cause damage to skin, eyes or cancer

Question 28

Use and Disadvantage of Gamma rays?

Answer 28

Radiation for cancer , nuclear power Released during nuclear reaction and can cause deaths

Question 29

kilo (k)

Answer 29

10^3

Question 30

deci (d)

Answer 30

10^-1

Question 31

centi (c)

Answer 31

10^-2

Question 32

milli (m)

Answer 32

10^-3

Question 33

micro (ų)

Answer 33

10^-6

Question 34

nano (n)

Answer 34

10^-9

Question 35

pico (p)

Answer 35

10^-12

Question 36

How do longitudinal waves work?

Answer 36

1. Particles are displaced to a maximum distance from rest position I the direction of propagation 2. Particle rest in the middle of compression, it changes direction past rest position to the middle of rarefaction 3. It stop, changes direction again and stops at rest position

Question 37

How are sound waves propagated?

Answer 37

1. Speaker vibrates causing air molecules to be compressed and rarefied 2. Air particles vibrate at the Sam frequency of speaker 3. Move toward person

Question 38

Echo?

Answer 38

Reflection of sound

Question 39

Pitch?

Answer 39

Refers to frequency

Question 40

Loudness?

Answer 40

Amplitude. Greater compression and rarefaction. dB

Question 41

Ultrasound?

Answer 41

Sound from 20 000Hz to 100 000Hz

Question 42

How are Em waves propagated

Answer 42

Accelerating charges induce changing electric fields Change in magnetic field produces changing electric field EM are created