WAVES

Question 1

A WAVE IS:

Answer 1

A disturbance that transfers energy without the net movement of matter

Question 2

TYPES OF WAVES: (AND EXAMPLES)

Answer 2

Mechanical (sound waves, ocean waves)
Electromagnetic (radio, x- ray, gamma)

Question 3

WAVE PROPOGATION:

Answer 3

Transverse: - can be Mech or EM.
-Propagation is perpendicular to wave motion
Longitudinal: - Have to be Mech.
-Propagation is parallel to wave motion.

Question 4

WAVE PROPERTIES:

Answer 4

peak, amplitude, wavelength, trough

Question 5

compressions and rarefactions

Answer 5

compressions: more dense
rarefaction: less dense

Question 6

ELECTROMAGNETIC SPECTRUM:

Answer 6

Radio>micro>Infared> light>UV>x-ray>Gamma

Question 7

SIMILARITES AND DIFFERENCES OF THE EM SPECTRUM:

Answer 7

Similarities:
-All EM waves travel at the same speed (speed of light)
-They are all transverse waves
-they all travel without matter
Differences:
-Different frequency, wavelength and energy.
-Wavelengths (radio= longest, gamma = shortest)
-Frequency (radio=least, gamma=most)

-increased frequency = decreased wavelength

Question 8

LUMINOUS:

Answer 8

emit light= luminous
don’t emit light= non - luminous

Question 9

LIGHT BEHAVIOUR WITH DIFFERENT OBJECTS: (TOT)

Answer 9

opAque, AR:
-absorbs light and reflects light.
TRanslucent, TRD:
-transmits light, refracts light, disperses light
Transparent, T:
-transmits light

Question 10

DISPERSION:
(colors)

Answer 10

(ROYGBIV)
RED- longest wavelength, bends the most
ORANGE
YELLOW
GREEN
BLUE
INDIGO
VIOLET- shortest wavelength

Question 11

COLOUR THEORY:

Answer 11

Red objects: reflect red light, absorb all other colors.
Blue objects: reflect blue light, absorb all other colors.
(BLUE LIGHT UNDER RED LIGHT APEARS BLACK)
White objects: reflect all colors, absorb none.
Black objects: reflect no color, absorb all colors

Question 12

TYPES OF REFLECTION: (R & D)

Answer 12

regular reflection- off of smooth surfaces. diffuse reflection- off of rough surfaces.

Question 13

LAW OF REFRACTION: (as light moves through……)

Answer 13

As light moves through different mediums it changes speed therefore it also changes direction and bends.
-Light travels faster in less dense mediums

Question 14

REFRACTIVE INDEX:

Answer 14

Fast.
-vacuum
-air
-water
-ice
-glass
-Perspex
-diamond
Slow.

Question 15

FaST
SoFA

Answer 15

FaST- fast>slow, towards normal.
SoFA- slow>fast, away from normal.

Question 16

SOUND TRAVELS:
(2 TYPES OF WAVES ML, fastest in solids because….)

Answer 16

-sound travels in mechanical and longitudinal waves.
-sound travels fastest in solids because the particles are more dense and tightly packed together, so it is therefore easier for a particle to find another close enough particle to pass on the vibration.
-sound travels slower liquids for the opposite reason to solids

Question 17

PRODUCTION OF SOUND WAVES: (sound waves are formed when…)

Answer 17

sound waves form when particles are vibrating against each other.

Question 18

PARTICLE THEORY: (- ^ if…)

Answer 18

-speed of sound increases if density and temperature increase.

Question 19

SOUND WAVES: (HIGH PITCH, LOW PITCH)

Answer 19

high pitch= increased frequency = decreased wavelength (HID)
low pitch= decreased frequency= increased wavelength (LDI)

Question 20

REFLECTION OF SOUND (WHAT IS IT)

Answer 20

the bouncing or reflecting of sound off an object

Question 21

THE EAR:

Answer 21

Pinna: captures sound waves from the environment.
Ear drum: vibrating membrane, responsible for sound transmission and protection.
Ossicles: 3 vibrating bones, responsible for sound transmission and sound amplification.
Cochlea: vibrating hairs, responsible for frequency detection and amplification.
Auditory nerve (cannal): Channels sound from the pinna to the ear drum.

Question 22

V=d/t
F=1/t
V=f/ג

(WILL GET THESE IN TEST)

Answer 22

V= speed (velocity)
T= time
D= distance
F= frequency
ג= wavelength

Question 23

THINGS TO STUDY

Answer 23

-concave, convex mirrors.
-Labeling ear.
-drawing the graph thing with the normal, angle of incidence and refraction
-go over practice tests