1. Kayla Lankford Logan Skorupa Santiago Vizcaino
Waves Chapter 14
Kayla Lankford
Logan Skorupa
Santiago Vizcaino

2. Properties of Waves
Waves- A disturbance that transfers energy from one place to another without matter moving a significant distance
There are many types of waves such as…
Longitudinal
Transversal
Ocean
Light
Sound
Electromagnetic

3. Longitudinal + Transversal Waves
Transversal Waves- Are waves that travel perpendicular to the disturbances direction. Ex) Ocean and light waves
Longitudinal Waves- Are waves that travel in the same direction as the disturbance. Ex) Sound waves and Earthquakes

4. General Properties of Waves
Crest
| Wave Height |
Trough

5. Measuring Waves
Frequency- The number of waves that pass a point in a given amount of time
Period- The time it takes a wavelength to pass a point
Speed = Wavelength X Frequency

6. Radioactivity
Chapter 23

7. Radioactivity & Radioactive Decay
Radioactivity – spontaneous change in an unstable nucle
Radioactive decay is commonly know as half-lives
Half-life – is the amount of time it takes for half of the radioactive nuclei to spontaneously loose particles
Each element or isotope has a different set half life
When different radioactive elements decay they change into different elements.

8. Types of radioactivity
Alpha α– an ionized helium atom is ejected from the nucleus
Least dangerous & Most easily absorbed
Beta β– an electron or positron is emitted by the atom
Gamma γ– a pocket of energy constantly decaying
Most dangerous & most penetrating

9. Uses of Radiation
There are many different uses of radiation, the most common uses are…..
Radiometric dating – uses beta rays to determine the age of various items
Chemotherapy – the use of Gamma particles to destroy cancerous cells
Fire alarms – use Alpha rays to detect smoke in the air

10. Radiation around us!

11. Practice Problems
When light passes from air into glass, do the following quantities increase, decrease, or stay the same?
a) speed
b) frequency
c) wavelength
2. Give an equation that relates the speed, frequency, and
wavelength of a wave.

12. Practice Problems Describe a use of γ radiation.