PS+7+-+6th+Period+Brown

Wave- A repeating disturbance or movement that transfers energy through matter or space. Energy- Kinetic, potential, elastic potential, chemical potential, and gravitational potential energy. Sound wave- A mechanical wave requiring a medium. Electromagnetic wave- A wave created by vibrating electric charges, can travel through a vacuum or through matter, and have a wide variety of frequencies and wavelengths. Mechanical waves- A wave involving vibration/motion and require a medium. Transverse wave- Wave for which the matter in the medium moves back and forth at right angles to the direction of the wave; has crests and troughs. Crest- Top of the wave. Trough-lowest point on a transverse way. Compression-compressed part of compressional wave. Rarefaction-more pressed apart in a compressional way. Wavelength- distance between one point on a wave and nearest point just like it. Frequency- # of times a crest passes by a set point within a second. Electromagnetic Waves- Vibrating electric charges. The Relationship Between Energy and Frequency- (Directly proportional) Electromagnetic radiation with higher frequency than visible light has higher energy, where as frequency and wavelength is the exact opposite. Constructive waves- Makes sounds louder. (Crests collide) Destructive waves- Makes sounds quieter. (Troughs collide) Law of Reflection- The angle of incidence is equal to the angle of reflection. Angle of Incidence- Angle of Refraction- The angle between a refracted ray or wave and the normal to a refracting surface. (related to angle of incidence) Mirror- Reflects light. Appears as far behind the mirror as the object is in front of it, same size, and upright. Refraction- The "breaking" of light. Like a straw in water. Light entering/leaving the prism- When white light enter a prism, it is bent and when it leaves it is scattered, thus creating a colorful spectrum.

1. jeffrey yells hello into a canyon. the waves travel 800m before reflecting off the canyon wall echoing back. it takes 4.7 seconds for jeffrey to hear the echo. what was the wave velocity? A) 170.2 m/s B) 3760 m/s C) 1880 m/s D)340.4 m/s

2.what kind of waves transmit energy from sun to earth? a) mechanical b) light c) transverse d) radio

3.the change in the direction of a wave as it passes from the one medium to another is known as a) diffraction b) intereference c) refraction d) reflection

4. which statement does not discribe the situation when an observer is moving toward a sounds source? a) encounters less frequency b) encounters higher pitch c) encounters more waves d) produces the same frequency waves  5.If a wave has a wavelength of 350 meters and a velocity of 4830 meters/minute what is its frequency? a. 1.4* 10^-1 Hz b. 7.2*10^--2 Hz c. 2.3*10-1 Hz d.1.4*10-2 Hz

6.A wave in a medium is traveling toward a less dense medium. Which of the following accurately describes the transition between mediums? a. The speed of the wave will decrease. b. The wavelength will increase. c.The frequency will increase. d.The velocity will decrease.

7.What statement most accurately descrives a characteristic of longitudinal waves? a. They transfer matter from one place to another. b.They are composed of rarefractions and compressions. c.Enrgy moves perpendicular to the particles in the medium. d. They can travel onlyin a vacum.

8.Select a statement that most accurately describes the following situation:An observer hears a pitch that is lower than what the source is producing.therefore, a. the observer hears a higher frequency and a longer wavelength. b.the observer hears a higher frequency and a shorter wavelength. c. the observer hears a lower frequency and a longer wavelength. d.the observer hears a lower frequency and a shorter wavelength.

9. If the observer's velocity is equal to the source's velocity, a. the observer hears an increase in the source's pitch. b.the observer hears a decrease in the source's pitch. c.the observer notices no difference in the source's pitch. d. the observer doesn't hear anything from the source.

10. What kind of waves transmit energy from the sun to Earth? a.mechanical waves b.light waves c.transverse waves d.radio waves