PHY-102: Wave, Sound, Light Exercise - Understanding Frequency, Speed, Color, Exams of Physics

Download PHY-102: Wave, Sound, Light Exercise - Understanding Frequency, Speed, Color and more Exams Physics in PDF only on Docsity! PHY-102: Wave, Sound, and Light Exercise Success Guaranteed for a Definite Success. Top Rated Exam Study Guide Latest Updated 2024! Complete the following exercises. 1. What is the source of all waves? Source of all wave motion is a disturbance in a matter or a vibration 2. 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 = 4 Hz b. What is the period of the wave in seconds? Period = 1/frequency = ¼ = 0.25 seconds c. What is the speed of the wave in meters per seconds? Speed = wavelength*frequency = 5*4 = 20 m/s d. What is the amplitude of the wave in meters? Amplitude = ½ *2m =1m 3. 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. Light travels faster (3.0*10^8m/sec) than sound (340m/sec). Therefore, we can see the crack of the batter faster than the sound since the light reaches our eyes quicker than the sound reaches our ears. 4. Why is the moon sometimes described as silent? PHY-102: Wave, Sound, and Light Exercise Success Guaranteed for a Definite Success. Top Rated Exam Study Guide Latest Updated 2024! Because it has no atmosphere/air which is the main medium to transport sound waves. 5. 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? Speed of sound is 340m/s Time for the echo is 2sec Let h = distance of the canyon wall PHY-102: Wave, Sound, and Light Exercise Success Guaranteed for a Definite Success. Top Rated Exam Study Guide Latest Updated 2024! E. X-rays F. Infrared radiation B<A<F<D<C<E 12. 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 a lunar eclipse, the earth completely blocks direct sunlight from reaching the moon. The only light reflected from the lunar surface has been refracted by the earth’s surface and hence appears reddish. 13. The distance from the sun to the Earth is 1.5 x 1011 m. How long does it take for light from the sun to reach the earth? Give your answer in seconds. Time =Distance/speed Speed of light = 3.0 x 108m/sec Distance = 1.5 x 1011m Time = (1.5 x 1011m)/ (3.0 x 108m/sec) = 500 sec 14. Why are polarized sunglasses particularly effective in reducing glare? Polarized glasses contain a special filter that blocks dangerous intensity of lights which are reflected by flat surfaces, and they help in reducing glare and discomfort. 15. Match the following colored objects with the way in which the colors are produced. 1) Red rose-Selective reflection 2) Rainbow - Refraction 3) Oil film- Interference 4) Peacock feather– Diffraction 5) Blue sky- Scattering PHY-102: Wave, Sound, and Light Exercise Success Guaranteed for a Definite Success. Top Rated Exam Study Guide Latest Updated 2024! A. Scattering B. Refraction C. Diffraction D. Interference PHY-102: Wave, Sound, and Light Exercise Success Guaranteed for a Definite Success. Top Rated Exam Study Guide Latest Updated 2024! E. Selective reflection The remaining questions are multiple-choice questions: 16. If the frequency of vibration is doubled, what happens to the period? 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. 17. What is the distance between two successive crests on a transverse wave called? A. Wavelength B. Period C. Amplitude D. Frequency E. Compression 18. Noise-cancelling earphones use which of the following phenomena? A. Frequency B. Constructive interference C. Destructive interference D. Resonance E. Beats 19. 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". PHY-102: Wave, Sound, and Light Exercise Success Guaranteed for a Definite Success. Top Rated Exam Study Guide Latest Updated 2024! E. Magenta, cyan, and yellow PHY-102: Wave, Sound, and Light Exercise Success Guaranteed for a Definite Success. Top Rated Exam Study Guide Latest Updated 2024! 24. If you shine a beam of red light and a beam of green light on the same area of a screen, what color will you see on the screen? A. Red B. Green C. White D. Yellow E. Cyan F. Magenta 25. If you mix equal amounts of cyan pigments and magenta pigments on a sheet of white paper, what color will you see on the paper? A. Red B. Blue C. Black D. Yellow E. Cyan F. Magenta