Download PHY-102: Wave, Sound, and Light Exercises Comprehensive Exam Study Guide Latest Updated 20 and more Exams Physics in PDF only on Docsity!
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Complete the following exercises.
- What is the source of all waves? Waves are begun from the vibrations of moving items, or it could be because of the exchange of vitality. As a rule, hotspot for every one of the waves is the vibration of moving items.
- A water wave vibrates up and down four times each second, the distance between two successive crests is 5 meters, and the height from the lowest part to the highest part of the wave is 2 meters. a. What is the frequency of the wave in hertz? Frequency is characterized as the quantity of cycles every second. As referenced in the given data that, wave vibrated 4 times each second, henceforth the frequency of the wave will be 4Hz. b. What is the period of the wave in seconds? Timespan is the time taken by one wave to finish its cycle and is the equal of frequency.
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Consequently, the timeframe of the wave will be ¼=0.25 seconds.
c. What is the speed of the wave in meters per seconds? The connection between the speed, frequency and wavelength is given as pursues, v= f λ Where f is the frequency of wave, which is 4Hz for this situation. The wavelength of the wave is the separation between to back to back coverings or troughs of wave, which is 5m for this situation. Subsequently the speed of wave will be v= f λ =(4)(5)=20ms− d. What is the amplitude of the wave in meters? Amplitude is the half of the tallness between the covering and trough of the wave, for this situation the stature between the outside layer and trough is 2m, henceforth the amplitude of the wave is 1m.
- When you sit in the stands at a baseball stadium, you will hear the crack of the bat a short time after you see the batter hit the ball. Explain. Siting in the stands at a baseball arena, one hears bat hitting the ball a short-lived timeframe after
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the speed of sound noticeable all around, that is the motive we first see the ball hitting the bat and after short defer we hear that hit.
- Why is the moon sometimes described as silent? Moon is occasionally portrayed as quiet since it has no climate and henceforth no wind, water or climate to make any sort of sound. Moreover, the moon encompassing has no vehicle for the sound to travel (Sound cannot go through space). In this way, moon is some of the time suggested as quiet
- You are hiking in a canyon and you notice an echo. You decide to let put a yell and notice it took 2 seconds before you heard the echo of your yell. How far away is the canyon wall that reflected your yell? As the speed of sound in air at ordinary climatic conditions is around 340 m/s, thus the utilizing the s=vt relationship the separation among you and ravine divider will be,(340)(1)=340m Time is taken as 1 sec, since 2 seconds are the complete time that sound took to venture out from mouth to divider and coming to back to you after reflection. That is the reason half of the time is taken.
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- Explain how the Doppler effect is used by the police to measure the speed of a car. Doppler's effect is a significant marvel that relates the frequencies of waves from two moving articles. It expresses that when an article is pushing toward or away from the wellspring of waves the recurrence of waves got at source will adjust moderately after reflection from the item. An alike idea is utilized in the police radar to quantify the speed of vehicle. A police radar radiates the microwaves toward vehicle moving, the waves reflects to radar from the vehicle and the change in recurrence is noted down. From the difference in reappearance, the speed of vehicle is estimated.
- The light from the sun has higher frequencies from one side of the sun than from the other side. What does that tell you about the sun? The data expressed in the inquiry prompts the way that the sun is pivoting that is the reason two distinct surfaces of sun gives two unique frequencies. The outside of sun moves towards the earth moves the light towards higher recurrence, then again, surface of sun moving from the earth moves the light towards the lower recurrence.
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the light. the goal is to be able to see the word both ways so the drivers can move out the
way during emergencies.
- What do radio waves, microwaves, light, and x-rays have in common? All the recorded waves are electromagnetic in nature and goes with a similar speed (300000 km/sec) in the vacuum. Although they have various wavelengths in the recurrence range however their tendency and voyaging velocity is normal.
- Rank the following electromagnetic waves in order of
increasing frequency. Radio waves, Microwaves , Infrared
Radiations ,Visible light, Ultra-Violet rays , X-rays
A. Microwaves B. Radio waves C. Ultraviolet radiation D. Visible light E. X-rays F. Infrared radiation
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- During a lunar eclipse the moon is in the shadow of the Earth. Why does the moon have a faint red color during the eclipse? During the lunar eclipse, the earth divides the sun and moon, and sun radiates through the climate from the edges of the earth. As, at whatever point sun radiates through the edges of the skyline, it has all the earmarks of being in the red range. That is the reason, the light creating from the edges of earth will be red and during the lunar eclipse, the moon is the shadow of earth thus mirrors a portion of the red light bowed from the edges of the earth.
- The distance from the sun to the Earth is 1.5 x 10^11 m. How long does it take for light from the sun to reach the earth? Give your answer in seconds.t = s v =1.5× 3× =500sec
- Why are polarized sunglasses particularly effective in reducing glare?
The vertical segments of the daylight are the ones that human need to see the things unmistakably through their eyes. Be that as it may, the occurrence light coming to eyes isn't from the immediate source just yet additionally the
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account of sun glasses, they just enable the vertical segments of light to arrive at the eye consequently, evacuating the glare and one can see the items plainly subsequently
- Match the following colored objects with the way in which the colors are produced.
- Red rose E.
- Rainbow B.
- Oil film D.
- Peacock feather C.
- Blue sky A.
A. Scattering B. Refraction C. Diffraction D. Interference E. Selective reflection
The remaining questions are multiple-choice questions:
- If the frequency of a vibration is doubled, what happens to the period?
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A. The period is doubled. B. The period remains the same. C. The period is reduced to one-quarter. D. The period is reduced to one-half E. The period is quadrupled.
- What is the distance between two successive crests on a transverse wave called? A. Wavelength B. Period C. Amplitude D. Frequency E. Compression
- Noise-cancelling earphones use which of the following phenomena? A. Frequency B. Constructive interference C. Destructive interference D. Resonance E. Beats
- If you mix equal amounts of cyan pigments and magenta pigments on a sheet of white paper, what color will you
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- If the sun were to suddenly "turn off’, we would not know about it for about 8 minutes. Why? A. It would take about 8 minutes to realize what happened because of the darkness. B. It takes about 8 minutes for the sun to "power down". C. It takes about 8 minutes for Earth to spin around so we can see the sun. D. It takes about 8 minutes for the light to travel from the sun to Earth.
- If the atmosphere was much thicker than it is now, how would the sun appear? A. The sun would appear the same. B. The sun would appear blue-violet. C. The sun would appear green-blue. D. The sun would appear red- orange. E. The sun would appear yellow-green.
- If you dip your finger in a tub of water at a constant rate, concentric circular waves with a constant spacing (wavelength) will form. If you double the frequency at which you dip your finger, what will happen to the wavelength?
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A. The wavelength is reduced to one-quarter. B. The wavelength is reduced to one- half. C. The wavelength is quadrupled. D. The wavelength is doubled. E. The wavelength remains the same.
- If you hear the clap of a thunder 5 seconds after seeing the flash of lightning, how far away from you did the lightning strike? A. About 5 miles B. About 5 kilometers C. About 1 mile D. About 1 kilometer
- What are the three paint colors used for color subtraction? A. Red, yellow, and blue B. Red, green, and blue C. Orange, purple, and green D. Magenta, green, and yellow E. Magenta, cyan, and yellow
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C. Whi te D. Yello w E. Cyan F. Magenta
