Class Notes (864,590)
CA (522,855)
McMaster (40,562)
PHYSICS (665)
PHYSICS 1L03 (115)
Reza Nejat (43)
Lecture

Set10-Ave.pdf

3 Pages
209 Views

Department
Physics
Course Code
PHYSICS 1L03
Professor
Reza Nejat

This preview shows page 1. Sign up to view the full 3 pages of the document.
Description
Phys 1L03 Tutorial session Set 10 Tenth series: Wave, sound wave 1. At Zion National Park a loud shout produces an echo 1.85 s later from a colourful sandstone cliff. How far away is the cliff? 2. Four waves are described by the following equations, all distances measured in centimeters and all time in seconds ya =10cos(3 x− 4 ) y =10cos(5 +4 ) t b yc = 20cos(−10 +60 ) t y = 20cos(−4 −20 ) t d a. Which waves travel in the +x-direction? b. Which waves travel in the –x-direction? c. Which wave has the highest frequency? d. Which wave has the greatest wavelength? e. Which wave has the greatest speed? 3. The three waves, A, B, C shown propagate on strings with equal tensions and equal mass per length, hence having the same speed. Rank the waves in order of increasing: a. frequency, b. wavelength 4. In Fig Below, Pipe A is made to oscillate in its third harmonic by a small internal sound source. Sound emitted at the right end happens to resonate four nearby pipes, each at with only one open end ( they are not drawn to scale). Pipe B oscillates in its lowest harmonic, pipe C in its second lowest harmonic, pipe D in its third lowest harmonic, and pipe E in its fourth lowest harmonic. Without computation, rank all five pipes according to their length, greatest first. (Hint: Draw the standing waves to scale and then draw the pipes to scale). 5. The displacement of the wave traveling in + x direction is: Y(x, t) = 0.35 (m) Sin (6x- 30t); where x is in meter and t is in second. a. If the wave reaches its maximum displacement after 0.04 sec, what is the value of x corresponding to y (max). b. How long does it take for the wave to take the total distance of 4 cycles? Solution: 1 6. At a distance of 30m from a jet engine, the sound intensity level is 130 dB. Serious, permanent hearing damage occurs rapidly at intensity levels this high, which is why you see airport personnel using hearing protection out in the runway. Assume the engine is isotropic and ignore reflections and absorption. At what distance is the intensity level 110 dB – still quite loud but below the threshold of I I L10 pain? IL = 10 log I = (10 )I 0 I0 7. The song of the Brown Creeper is very high in frequency – as high as 8 kHz. Many people who have lost some of their hearing can’t hear it at all. Suppose that you are out in the woods and hear the song. If the intensity of the song at your position is 1.4x 10 – 8W/m , and the frequency is 6.0 kHz, what are the pressure and displacement amplitudes? (Assume the temperature is 20 degrees Celsius.) P0 ⇒ P =0 2I ρv v = 343 m/s P 0 ω vρ A 0 I = 2ρ v
More Less
Unlock Document
Subscribers Only

Only page 1 are available for preview. Some parts have been intentionally blurred.

Unlock Document
Subscribers Only
You're Reading a Preview

Unlock to view full version

Unlock Document
Subscribers Only

Log In


OR

Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


OR

By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.


Submit