A sinusoidal wave travels along a string. The time for a particular point to move from maximum displacement to zero is 0.186 s. (a) What is the period? (b) What is the frequency? (c) If the wavelength is 1.70 m, what is the wave speed?

In the figure, two speakers separated by distance d = 1.90 m are in phase. Assume the amplitudes of the sound waves from the speakers are approximately the same at the listener's ear at distance d₂ = 3.95 m directly in front of one speaker. Consider the full audible range for normal hearing, 20 Hz to 20 kHz and use 343 m/s for the speed of sound in air. (a) What is the lowest frequency that gives minimum signal (destructive interference) at the listener's ear? (b) What is the second lowest frequency that gives minimum signal? (c) What is the third lowest frequency that gives minimum signal? (d) What is the lowest frequency that gives maximum signal (constructive interference) at the listener's ear? (e) What is the second lowest frequency that gives maximum signal? (f) What is the third lowest frequency that gives maximum signal?

Diagnostic ultrasound of frequency 5.80 MHz is used to examine tumors in soft tissue. (a) What is the wavelength in air of such a sound wave? (Use 343 m/s for the speed of sound in air.) (b) If the speed of sound in tissue is 1600 m/s, what is the wavelength of this wave in tissue?

The pressure in a traveling sound wave is given by the equation (a) Find the pressure amplitude. (b) Find the frequency. (c) Find the wavelength. (d) Find the speed of the wave.

English (United States) 1. Jamie and Addy are driving in their car in the school parking lot. While they are driving Addy decides to play his clarinet out of the window of the car. A student they are driving away from at a speed of 8.5 m/s hears a frequency of 640 Hz. (The Speed of sound is 341 m/s) a) What was the frequency of the note played on the clarinet? b) How fast would they have to drive away from the student so that they hear a frequency of 600 Hz? Student observation

5. Do it again, but this time make a positive wave by quickly yanking the wrench up and backdown. Are the incident and reflected waves still opposites?

Problem 39. Repeat Problem 38 if µ1 =0.5 kg/m and µ2=0.2kg/m.

Compute the material dispersion for a wavelength 10 nm lower than the zero-dispersion wavelength (assumed to be 1300 nm).

3) Electrons are ejected from a certain metal only when the wavelength of incident light is less than or equal to 4000 Å. What wavelength would be required to eject some electrons with a kinetic energy of 2 eV from this metal?

5. A train approaches a station and sounds its horn which has a natural frequency of 150Hz. The train is travelling at 40 m/s and the speed of sound in air is 340 m/s. a. What frequency does a person standing at the station hear? (10 points) b. What frequency does a person sitting on the train hear? (10 points)