University:
Campbell University
Course:
PHYS 222 | General Physics II
Academic year:

2020
Views:

351

Pages:

3
Author:

Lily Callahan

KEY Waves Review 2 Name - ___________________ 1.) If waves maintain a constant speed while passing through the same medium, what will happen to the wavelength if the frequency is doubled, and if the amplitude is doubled? If the frequency is doubled while the speed is maintained then the wavelength must be half the length. If the frequency is doubled and the speed is maintained NOTHING must happen to the amplitude as this is a measure of the energy in the wave which is independent of frequency and speed. 2.) What is the frequency of a sound wave if its wavelength is 1.70 and the speed of sound is 340 ? Answer - = 340 = 1.70 = 200 3.) Waves of = 2.0 are transmitted through a steel spring, what is the wavelength if the spring is 4.0 long and waves take 1.1 × 10 to travel its length? Answer - = ∆ ∆ = = . .× ! 363.636 = 2.0 = 363.636 = 1.8 × 10 4.) A student measures the speed of water waves to be 0.25 , and the wavelength to be 0.025 , find the frequency. Answer - = 0.25 = 0.025 = 10. 5.) A 600. % light wave has what frequency and what color would it appear as? Answer - = 3.0 × 10& = 6.0 × 10' = 5.00 × 10 orangy-yellow 6.) What is the wavelength of a microwave whose frequency is 3.0 × 10 ? Answer - = 3.0 × 10& = 3.0 × 10 = 0.01 1 KEY 7.) What is the difference between a pulse and a wave? A pulse is a single disturbance of a medium where as a wave is the continual disturbance of the wave. 8.) Sketch a wave of 4( , show crests, troughs, the wavelength, frequency, and amplitude. Frequency is # of wavelengths/second wavelength amplitude Frequency for this standing wave is 4( crests troughs 9.) How are period and frequency related? Period is the inverse of frequency. 10.) A dog wags its tail 50 times in 20 , find its frequency and period. Answer – frequency is vibrations per second so = Period is the inverse of frequency so - = ) * + ., = , = 2.5 - = 0.4 11.) What is the difference between a transverse and a longitudinal wave? Transverse has the particle movement perpendicular to the wave direction and longitudinal has the particle parallel to the wave direction. 12.) A wave travels from a dense medium to a less dense medium, the media are significantly different. Sketch the result. Medium change Dense medium Less dense medium 13.) Sketch two pulses which will exhibit constructive interference. Repeat for destructive interference. Constructive Destructive 2 KEY 14.) Sketch single slit diffraction. 15.) A siren approaches you, as a result of _Doppler shift_ its frequency will be _higher_, wavelength will be _shorter_, and sound will be __higher__. 16.) Sketch the result of the two pulses meeting, what is the principle called which causes this result? 17.) Waves on Okanagan Lake pass by a point every 1.5 . If they travel 20. in 30. ./0%1 find their speed, frequency, and wavelength. Answer - = = ∆ ∆ 4 = = = 2 ., 0.667 = 0.667 = +0.667 = 0.667 = 1.0 3

How Does the Frequency of a Wave Change When the Period of the Wave is Doubled

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