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Chapter 25 science
chapterr 25 study guide
| Question | Answer |
|---|---|
| The repating back-and-forth motion where everything is equal; a WIGGLE in TIME | vibration |
| True or False: a vibration can happen longer than a few seconds | false, it can only happen in one instnace |
| What are 2 examples of forms of energy that move through space as waves? | Light and Sound |
| What does a pendulum depend on? | the length of the pendulum and the acceleraton of gravity |
| Pendulum | Weight(bob) attached to a string that is free to swing; swings back and forth |
| one complete back and for swing is a ... | cycle |
| TIME for one CYCLE | a PERIOD |
| A period does NOT depend o the ___________ or sixe of ______________ | weight;swing |
| The longer the period the ____________ the period | longer(and more frequently) |
| True or False: Two pendulums of the same length have the sme period regardless of the mass | TRUE |
| What is the source of all waves | Something that vibrates |
| Simple harmonic motion- | the back and forth vibrating motion (oscillation) |
| The pictorial representation of a wave formed by swinging pedulum or bouncing spring is a ...? | SPINE CURVE |
| high point of a wave | crest |
| low point of a wave | trough |
| AMPLITUDE is the ____________ from the _________ to the crest (or trough) of the wave | distance; midpoint |
| Higher the wave the _______ energy the wave has | MORE |
| The lower the wave the ________ engergy the wave has | LESS |
| What is the symbol for wavelength called? | lambda |
| What is hte distance from the top on one crest ot the top of the next one | wavelength |
| What is the unit for frequency | HERTZ |
| what is the number of cycles | FREQUENCY |
| How many vibrations are there for frequency? | one cycle PER one second |
| what is the source of all waves | a vibration |
| the frequency of the vibrating source is the frequency of the ________________ | waves |
| period is _____ per ____________ | seconds per cycle |
| what is the symbol for period | T (capital T) |
| what are the equations for period | T=1/f AND/ OR f=1/T |
| what is a medium | something the wav goes through; AIR = MEDIUM |
| TRUE or FALSE: the medium moves along with the wave. | FALSE! the medium moves up and down while the disturbance moves the energy forward |
| how can u calculat the speed of a wave? | by multiplying the wavelength by the frequency |
| long waves have ____________ frequency | low |
| shot waves have _______________ frequency | high |
| what are transverse waves? | the motion of the medium(air or water) is at RIGHT ANGLES to the direction of the wave motion. UP AND DOWN! example: radio waves and light waves |
| what are longitudinal waves? | the medium moves BACK AND FORTH in the same direction in whihc the wave travels example: a sound wave and a spring |
| what is a longitudinal wave also called? | compression wave- because part of the wave compreses |
| what is the amplitude of a compression wave? | how far spread out the trough is |
| when do interference patterns occur? | when waves from different sources arrive at the same point at the same time |
| wht is interference caused by? | overlapping waves |
| what is called when a crest overlaps another crest from a different wave | CONSTRUCTIVE INTERFERENCE (the reinforcement) |
| what is tcalled when a crest of one wave overlaps a trough of another | DESTRUcTiVE intERFERENCE (cancellation) (the wave cancels out or a decreased amplitude) |
| what is destructive interference called? | OUT OF PHASE |
| what is in phase? | CONSTRUCTIVE INTERFERENCE |
| a standing wave looks like the _________________________________________ | medium isnt moving at all |
| when does a standing wave form? | only if half a wavelength or a multiple of half a wavelength fits ecatly into the length of the vibrating medium |
| A standing wave happens when... | the original wave is relected back after reaching a rigid surface |
| a standing wave is the result of an | interference |
| NODE | a destructive interference |
| ANTINODE | a constructive interference |
| different ______________ cause standing wave patterns | frequencies |
| where can standing waves be found? | in strings of musical instruments, organ pipes |
| what is the doppler effect | a change in frequency due to the motion of the waves |
| the closer the sound from an object is to you the ______________ pitched it is | HIGHER |
| what clor dectects hgiher frequency | BLUE |
| what color detects lower frequency | RED |
| when a source movs toward you do you measure an increase or decrease in wave speed | NEIthER! it si the frequency of a wave the changes. WAVE SPEEN DOESNT CHANGE. |
| when does a bow wave occur? | when a wave source moves faster than the waves it produces. |
| what is called when a plane goes fater than sound | SUPERSONIC |
| what are bow waves | overlapping edges of wave crests procduced when the souce is moving faster than the wave it makes |
| The faster the source moves the ______________ the _______________ shape | NARROWER the V shape |
| when does a shock wave occur | when an obect moves FASTER than the SPEED OF SOUND |
| what is a shock wave | overplapping edges of spherical wave crests produced when a souce is moving faster tha nthe wave |
| what shape does a shock wave form | a 3D cone shape |
| what is a sonic boom | concial shell of compressed air that sweeps behind a supersonic object reachers the listeners ears |
Created by:
tagne1
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