Chap 9 - 11

Question 1

What is a transverse wave and some examples

Answer 1

Transverse wave is perpendicular to the vibration of particles.
Light, EM waves, water waves

Question 2

What is longitudinal wave and it’s examples

Answer 2

Longitudinal wave travels parallel to the vibration of the wave. it travels with compressions and rarefactions
Sound

Question 3

Speed of a wave formula

Answer 3

speed = frequency * wavelength
m/s = Hz * m

Question 4

What affects loudness of sound

Answer 4

Amplitude(distance from crest of wave to normal)

Question 5

What affects the pitch of sound

Answer 5

the frequency of the waves

Question 6

speed of sound in an echo

Answer 6

speed = 2distance/time

Question 7

What is sound fastest and slowest in

Answer 7

Fastest in solids
Slowest in air

Question 8

EM spectrum - slowest to fastest

Answer 8

Radiowaves
microwaves
infrared
visible light
ultraviolet
xray
gamma ray

Question 9

Application of radio waves

Answer 9

radio and television broadcast

Question 10

Application of microwaves

Answer 10

cooking in microwave oven, cell phones and satellite communication

Question 11

Application of infrared

Answer 11

remote controllers, alarms, thermometers

Question 12

Application of ultraviolet

Answer 12

Sunbed

Question 13

Application of Xray

Answer 13

detect bone fractures

Question 14

Application of Gamma ray

Answer 14

kills cancerous cells

Question 15

Law of reflection

Answer 15

Angle of incidence is equal to the angle of angle of reflection.

Question 16

Properties of images formed on plane mirrors

Answer 16

Upright
Virtual
Same size
Laterally inverted
Image distance = Object distance

Question 17

What is refraction

Answer 17

The bending of light when it travels from an optically less dense medium to an optically dense medium/optically dense medium to optically less dense medium

Question 18

Refractive index formula

Answer 18

n = sin i/sin r
n = refractive index
i = angle of incidence
r = angle of refraction
O R
n = c/v
c = speed of light in air
v = speed of light in medium

Question 19

What is focal length

Answer 19

Focal length is the distance between optical center and focal point

Question 20

Characteristics of image when object is at infinity in convergent lens and it’s application

Answer 20

Real
at focal point
Used in telescope

Question 21

Characteristics of image when object is at distance greater then 2Focal length and it’s application

Answer 21

Real
Inverted
Diminished
Between F and 2F
Camera

Question 22

Characteristics of image when object is at 2F and it’s application

Answer 22

Real
Inverted
Same size
At 2F
Photocopier

Question 23

Characteristics of image when object is at F

Answer 23

object is at infinity

Question 24

Characteristics of image when object is at distance less than F

Answer 24

Virtual
Upright
Magnified
Behind the object
Magnifying glass

Question 25

How does sound travel in air

Answer 25

Sound is a longitudinal wave. it travels through a series of compressions and rarefactions. energy is passed from particle to particle causing sound to be transmitted

Question 26

How does sound travel in air

Answer 26

Sound is a longitudinal wave. it travels through a series of compressions and rarefactions. energy is passed from particle to particle causing sound to be transmitted