University:
University of Colorado Boulder
Course:
PHYS 2020 | General Physics 2
Academic year:

2024
Views:

135

Pages:

2
Author:

verrainelle9hkq

Name: Waves L^L Date: 0 A wave is a traveling oscillator that carries energy from one place to another. A high point of a wave is called a crest . A low point is called a trough . The amplitude of a wave is half the distance from a crest to a trough. The distance from one crest to the next is called the wavelength . Wavelength can also be measured from trough to trough or from any point on the wave to the next place where that point occurs. Amplitude Crest ! / \ \ One wavelength is crest to crest . N / \ / N \ /. * / Trough The speed of a wave Speed (m/ sec> r f v Frequency (hertz) ^ Wavelength (meters) The frequency of a wave is 40 Hz and its speed is 100 meters per second . What is the wavelength of this wave? Given Frequency = 40 Hz; Speed = 100 m/sec Looking for The wavelength Relationships Speed = Frequency x Wavelength, therefore Speed * Frequency = Wavelength C b. The wavelength of this wave is 2.5 meters. > (/ 0) CD E How many wavelengths are represented in the wave above? c What is the amplitude of the wave shown ° a abovc? S , ' _ 100 m/sec 100 m/scc Wavelength = 40 Hz 40 cycles/sec 2.5 meters = Wavelength > 1 . On the graphic at right label the following parts of a wave: one wavelength, half of a wavelength, the amplitude, a crest, and a trough. a. Solution o Page 2 of 2 2. Use the grids below to draw the following waves. Be sure to label the v-axis to indicate the measurement scale. a. A wave with an amplitude of 1 cm and a wavelength of 2 cm b. A wave with an amplitude of 1.5 cm and a wavelength of 3 cm ——— — — — —— ———— —— 3. A water wave has a frequency of 2 hertz and a wavelength of 5 meters. Calculate its speed. jQ 4. A wave has a speed of 50 m/sec and a frequency of 10 Hz. Calculate its wavelength. 5. A wave has a speed of 30 m/sec and a wavelength of 3 meters. Calculate its frequency. j 6. A wave has a period of 2 seconds and a wavelength of 4 meters.Calculatc its frequency and speed. Note: Recall thtft the frequency qfa wave equals I / period and the period of a wave equals l /frequency. hrs / S A sound wave travels at 330 m/sec aiuf has a wavelength of 2 meters. Calculate its frequency and period . » A/OlPSfc c. ’ The frequenc oMvave A is 250 hertz and the wavelength is 30 centimeters. The frequency of wave B is 260 hertz and the wavelength is 25 centimeters. Whiich is the faster wave? 7. 8. ^ ^ ^^ 9. The period of a wave is equal to the time it takes for one wavelength to pass by a fixed point. You stand on a pier watching water waves and see 10 wavelengths pass by in a time of 40 seconds. ^8 a. What is the period of the water waves? b. What is the frequency of the water waves? c. If the wavelength is 3 meters, what is the wave speed? . *7 , ^ *