PS+7+-+4th+Period+Brown

Question 1.**The change in the direction of a wave as it passes from one medium to anotherr is know as?** Answer: a. diffraction b.interference d.reflection 2.**which of the statements does NOT accurately describe the situation when an observer is moving toward a sound's source?** Answer: a. The observer encounters less frequency. c.The observer encounters more waves. d. The source is producing the same frequency waves. 3.**If a wave has a wavelength of 350 meters and a velocity of 4830 meters/minute what is its frequency?** Answer: a. 1.4* 10^-1 Hz b. 7.2*10^--2 Hz c. 2.3*10-1 Hz d.1.4*10-2 Hz 4.**A wave in a medium is traveling toward a less dense medium. Which of the following accurately describes the transition between mediums?** Answer: a. The speed of the wave will decrease. b. The wavelength will increase. c.The frequency will increase. d.The velocity will decrease. 5.**//What statement most accurately describes a characteristic of longitudinal waves?//** Answer: a. They transfer matter from one place to another. c.Enrgy moves perpendicular to the particles in the medium. d. They can travel only in a vacum. 6.//**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?//** Answer: a. the observer hears a higher frequency and a longer wavelength. b.the observer hears a higher frequency and a shorter wavelength. d.the observer hears a lower frequency and a shorter wavelength. 7. **//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. 8. **//What kind of waves transmit energy from the sun to Earth//?** Answer: a.mechanical waves b.light waves c.transverse waves d.radio waves 9. **As white light enters a prism, it exits displaying the colors of the visible spectrum. List the colors of the visible spectrum in order from longest to shortest wavelength.** Answer: a. violet,blue,green,orange,yellowm,red b. red,yellow,orange,green,blue,green c. violet,blue,green,yellow,orange,red d.red,orange,yellow,green,blue,violet 10.**Jeffrey yells 'hello' into a canyon. the waves travel 800 meters before reflecting off the canyon wall and echoing back to jeffery. It takes 4.7 seconds for jeffery to hear his echo. what is the velocity of the wave?** Answer: a. 170.2m/s b.3760m/s c. 1880m/s d. 340.4m/s 11.**Select a statement that most accurately desvribes the following situation: an observer hears a higher pitch than the source is producing.Therefore,** Answer: b. The source is stationary. c. The source is moving away from the observer. d. The source is rotating. 12. **light waves travel at the speed of light, 3*10^8 m/s. What is the frequency of a light wave with a wavelength of 5 * 10^-9 m?** Answer: a. 15*10^-1 Hz b.0.6 * 10^16 Hz c.1.67 * 10^17 Hz d.6.0 * 10^16 Hz 13.**What's the difference in wavelength size between gamma rays and radar?** Answer: a. 10^-16 meters b. 10^12 meters c. 10^16 meters d. 10^-12 meters 14. **Which of the following gives the correct order of the various electromagnetic waves from higher to lowest frequency?** Answer: a. X-rays, gamma rays, visible light, microwaves, radiation b. microwaves, infrared radiation, ultraviolet, gamma rays c. **gamma rays, ultraviolet, visible light, microwaves, radio waves** d. radio waves, visible light, ultraviolet, x-rays, gamma rays
 * c.refraction**
 * b.The observer encounters a higher pitch**
 * b.They are composed of rarefractions and compressions.**
 * c. the observer hears a lower frequency and a longer wavelength.**
 * a. The source is moving toward the observer.**


 * A wave is a rhymetic dursturbic that travel through energy.
 * The energy of a wave in a slinky will pass from one end to another.
 * A sound wave is a mechanical disturbice caused by a force moveing molecules in the medium through which it passes
 * A light wave is energy that can be transmitted without mechanical disturbice of the particels of the medium.
 * Electromagnetic waves may travel through a medium but do not need a medium for transmission.
 * Mechanical waves must have a medium through which to move.
 * Transverse waves the waves move through the medium in a direction which is perpendicular(up and down)
 * Longitudinal/Compression the wave move through the medium in a direction that is sraight across.
 * Crest is the section of a wave that rises above an undisturbed position.
 * The trough is the lowest point on a wave.
 * Compression- an increase in the density of something
 * Rarefraction-A decrease in density and pressure in a medium, such as air, caused by the passage of a sound wave.
 * Wavelength-the length of one wave.(The distance between two crest and is mesured in meters.
 * Frequency-The number of waves that pass by in a second.
 * Hertz-is a measure of frequency, informally defined as the number of events occurring per second.
 * Amplitude- the height or srength of a wave.
 * Period-The time for one cycle or the time for one complete wave to pass.
 * The electromagnetic spectum is the entire range of frequencies of electromagnetic radiation.But different cause they have different wavelength.
 * The relationship between energy in frequency is the higher the frequency, the higher the energy.
 * The relationship between frequency and wavelength is higher frequency the waves have shorter wavelength.
 * Constructive-Makes effects greater.
 * Destructive-Lessens the effect
 * Sound wave is a longitudinal/Compressional wave.It also requires a medium.
 * Sound waves interfere by Desructive interference make sounds quiter. Consructive interference makes sound louder.
 * Law Of Reflection states that says the angle incidence is equal to the angle of reflection.
 * The angle of incidence is the angle between the incident ray and a line perpendicular to the surface.
 * Mirror- light waves reflect in plain mirrors
 * Diffraction-is the bending of a wave around a barrier or around the edges of an opening.
 * Refraction- the change in direction of a propagating wave (light or sound) when passing from one medium to another.
 * When light enter and leave a prism light slows down when it enters the prism and bends down when it srikes it at angle when light exit the prism the prism speeds back up and bend down again.
 * White light in a prism- when white light enters another prism the colors may spread out this is because the voilet end of the spetrum slows down more then the red end and therefor bends more.
 * Concave lens- a lens such that a parallel beam of light passing through it is caused to diverge or spread out.
 * Convex lens- lens such that a beam of light passing through it is brought to a point or focus.
 * Doppler effect- is an apparent frequency shift due to the relative motion of an observer or way from an observer.