Physics 3 Flashcards
(23 cards)
What does waves transfer
Energy without transferring matter
Describe what is meant by wave motion
Is created by a series of back and forward movements, vibrations or oscillation
How waves can undergo (2)
Reflection at a plane surface
Refraction due to a change of speed
Describe the characteristics of an optical image
by a vertical plane mirror (3)
Same size
Same distance from mirror
Laterally inverted
Describe the characteristics of an image by a thin converging lens (4)
Enlarged
Same size
Diminished
Upright and inverted
State the seven colours of the visible
spectrum in order of frequency (high-low)
Violet
Indigo
Blue
Green
Yellow
Orange
Red
State the seven colours of the visible
spectrum in order of wavelenght (high-low)
Red
Orange
Yellow
Green
Blue
Indigo
Violet
State the main 7 regions of the electromagnetic
spectrum in order of frequency (high-low)
Gamma rays
X-Rays
Ultraviolet radiation
Visible light
Infrared radiation
Micro-waves
Radio waves
State the main 7 regions of the electromagnetic
spectrum in order of wavelenght (high-low)
Radio waves
Micro-waves
Infrared radiation
Visible light
Ultraviolet radiation
X-Rays
Gamma rays
All electromagnetic waves travel …
At the same high speed in a vacuum
State applications of radio waves
radio and television transmissions
State applications of microwaves
satellite television, mobile phone, microwave ovens
State applications of infrared radiation
remote controllers for televisions, thermal imaging
State applications of visible light
vision and photography
State applications of ultraviolet
detecting fake bank notes
State applications of X-rays
medical scanning and security scanners
State applications of gamma rays
detection of cancer and its treatment
Harmful effects on people of excessive exposure to ultraviolet
damage to surface cells and eyes, leading to skin cancer and eye conditions
Harmful effects on people of excessive exposure to X-rays and gamma rays
mutation or damage to cells in the body
Describe the production of sound
vibrating sources
State the approximate range of frequencies
audible to humans
20Hz to 20kHz
A … is needed to transmit sound waves
medium
Define ultrasound
sound with a frequency higher than 20kHz
