Chap 9 - 11 Flashcards
What is a transverse wave and some examples
Transverse wave is perpendicular to the vibration of particles.
Light, EM waves, water waves
What is longitudinal wave and it’s examples
Longitudinal wave travels parallel to the vibration of the wave. it travels with compressions and rarefactions
Sound
Speed of a wave formula
speed = frequency * wavelength
m/s = Hz * m
What affects loudness of sound
Amplitude(distance from crest of wave to normal)
What affects the pitch of sound
the frequency of the waves
speed of sound in an echo
speed = 2distance/time
What is sound fastest and slowest in
Fastest in solids
Slowest in air
EM spectrum - slowest to fastest
Radiowaves
microwaves
infrared
visible light
ultraviolet
xray
gamma ray
Application of radio waves
radio and television broadcast
Application of microwaves
cooking in microwave oven, cell phones and satellite communication
Application of infrared
remote controllers, alarms, thermometers
Application of ultraviolet
Sunbed
Application of Xray
detect bone fractures
Application of Gamma ray
kills cancerous cells
Law of reflection
Angle of incidence is equal to the angle of angle of reflection.
Properties of images formed on plane mirrors
Upright
Virtual
Same size
Laterally inverted
Image distance = Object distance
What is refraction
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
Refractive index formula
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
What is focal length
Focal length is the distance between optical center and focal point
Characteristics of image when object is at infinity in convergent lens and it’s application
Real
at focal point
Used in telescope
Characteristics of image when object is at distance greater then 2Focal length and it’s application
Real
Inverted
Diminished
Between F and 2F
Camera
Characteristics of image when object is at 2F and it’s application
Real
Inverted
Same size
At 2F
Photocopier
Characteristics of image when object is at F
object is at infinity
Characteristics of image when object is at distance less than F
Virtual
Upright
Magnified
Behind the object
Magnifying glass
How does sound travel in air
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
How does sound travel in air
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
