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Chapter 15 Worksheet 4 (wsI5.4). Acid-Base Properties of Salt Solution,
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CHAPTER 4. THE FOX IN THE KONJAKU MONOGATARI. The Story of a Young
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Chapter 4. Tools for Correlative Cryo-Fluorescence Microscopy and Cryo-
Electron Tomography Applied to Whole. Mitochondria in Human Endothelial
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Wave- disturbance that transfers energy through matter or space. Causes no permanent displacement. Energy- application of force over distance. Force- Push or pull on an object. Wavelength- Distance from crest to crest, or trough to trough. Crest- highest point of a wave. Trough- lowest point of a wave. Amplitude- height of a wave crest or depth of a trough, measured from its rest position. Medium- Is the matter a wave travels through.
Transverse Waves: 1) Compression/Longitudinal 2) Transverse Transverse Wave- matter moves back and forth perpendicular to direction the wave travels. (see figure 4.7)
Compression/ Longitudinal Wave: Matter moves back and forth along the same direction that the wave travels. (see figure 4.8)
• Water and seismic (earthquake) waves are a combination of transverse and compression waves. • Visible light and radio waves travel through space. (no medium)
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Frequency = cycles/seconds
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Frequency is measured in “hertz” (hz). - Ex. The music express goes around 48 times in 12 seconds, what is its frequency?
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Frequency = cycles/ seconds F = 48/12 F = 4 hz. Answer page 138 “what to do” #1) a – e. (answers on next slide)
1a) 4 hz 1b) 12 revolutions/ 120 s. = 0.1 Hz 1c) 30 flashes/ 30 s. = 1 Hz 1d) 18 beats/ 20 s. = 0.9 Hz 1e) 2000 revolutions/ 60 s. = 33.3 Hz
1) Find the following for each example:
amplitude: frequency: wavelength: -
BC SCIENCE 8 Page 143: Questions #1 – 5 + 8 - 9.
Visible Light: • Visible light: is a mixture of all the colours of the rainbow. •Different colours of light have different wavelengths.
•An object looks blue in sunlight because it reflects blue and absorbs colours other than blue from the sunlight.
Refraction: Is the bending or changing direction of a wave as it passes from one material to another.
Reflection: Occurs when a light wave strikes an object and bounces off.
The Visible Spectrum is known as:
Red Orange Yellow Blue Indigo Violet
ROY G. BIV
Green
Think about the question and exchange your thoughts with someone beside you without leaving your seat.
Check your Understanding Pg#151 #1- 9 + 12a
Gamma Ray burst from dying Star
Light Spreads out and radiates from the Sun and other stars in all directions. Energy, such as light, that travels by radiation is often called radiant energy. The Sun also radiates invisible energy. The light we see is just a tiny band of a much broader spectrum of energy.
Electromagnetic radiation is the transmission of energy from the longest radio waves to the shortest gamma rays.
Electromagnetic waves detected by our eyes are a small portion of the entire spectrum. There are devices that can detect other frequencies:
Have the longest wavelength and lowest energy and frequency compared to all other types. Radio, television, and radar are examples of uses for radio waves.
Microwaves Have the shortest wavelength and highest frequency of all the radio waves. Only foods that contain water particles can be heated using microwaves. -Another example: telecommunications satellites.
Infrared waves have a longer wavelength and lower energy and frequency compared to light. Examples: Television remote controls and DVD players. Infrared radiation is used to catch criminals at night etc.
Pg #157 #1-5
The Hubble Telescope takes such clear images to send back to Earth because it orbits outside the Earth’s atmosphere.
Ultraviolet Waves Just beyond the violet end of the spectrum (ROY G BIV) are the ultraviolet (UV) waves. These
waves have a shorter wavelength and higher energy and frequency than that of visible light. Positive & Negative EX. Ultraviolet radiation allows your skin to make vitamin D for healthy bones and teeth, too much UV can result in sunburns, skin cancers, and damage to the surface of the eye.
The earth’s atmosphere absorbs some of the UV radiation emitted by the Sun.
The ozone layer protects the earth from harmful radiation.
X RAYS: X Rays have a much shorter wavelength and higher energy and frequency than UV rays. EX. X Rays are commonly used to photograph teeth and bones because they can easily pass through tissues such as skin and muscle. Airports also use X rays to scan luggage.
Gamma Rays (2 min 30 secs) Gamma rays are the highest energy and frequency and shortest wavelength of the electromagnetic spectrum. Gamma rays result from nuclear reactions and are produced from the hottest regions of the universe.
