Chapter 11 Flashcards
(23 cards)
What is light
a type of energy detected by the eye, made up of tiny packets of energy called photons
what is more energy efficient? Incandescent or fluorescent light bulbs, why
Fluorescent because they use less electricity and produce less heat
what are features of semiconductors
- very efficient
- don’t require a filament
- don’t produce excess heat by-product
uses of radiowaves
- AM/FM
- TV signals
- Cell phones
uses of microwaves
- Microwave ovens
- Telecommunications
uses of infrared light
- physical therapy
- heat detection
- keeping food warm (restaurants)
uses of ultraviolet (UV) light
- From sun… causes skin to tan and burn
- Increased risk of skin cancer
- stimulates production of vitamin D
uses of X-rays
- medical imaging
- security equipment
uses of gamma rays
- cancer treatment
what are the Laws of Reflection
- the Angle of Incidence = Angle of Reflection
- The incident ray, reflected ray, and the normal all life in the same plane
does light require a medium for transmission? Why/why not
No. It travels through the vacuum of outer space and is transferred through radiation
what did Tomas Young discover
that light shows wave-like properties, the Wave Theory of light
what did James Maxwell discover
he predicted that electricity and magnetism couple together. The electromagnetic Theory: waves do not require mediums to travel and they travel at speed of lgith
what did Heinrich Hertz discover
discovered radio-waves (low-energy waves with a long wavelength)
what did William Konrad discover
discovered X-rays
as you go left to right on the electromagnetic spectrum, wave lengths get ? and energy ?
wave lengths get shorter and energy increases
what is visible light
a smaller region of the electromagnetic spectrum that human eyes can detect. (Red lowest violet highest)
Concave: what light rays are used and what is SALT of image when object is outside C?
1,3
S- smaller
A- inverted
L- between C & F
T- real
Concave: what light rays are used and what is SALT of image when object is at C?
1,3
S- same
A- inverted
L- at C
T- real
Concave: what light rays are used and what is SALT of image when object is between C & F?
1,3
S- larger
A- inverted
L- outside C
T- real
Concave: what light rays are used and what is SALT of image when object is at F?
1,4
no clear image is formed because reflected rays are parallel
Concave: what light rays are used and what is SALT of image when object is BEYOND F?
1,4
S- larger
A- upright
L- behind mirror
T- virtual
what light rays are always used for convex mirrors and what is the SALT
1 and 3
S- smaller
A- upright
L- behind mirror
T- virtual
