Calculate the following; a) the speed of sound propagation in air when the temperature is +20 ˚C and – 30 ˚C, b) the speed of propagation of a longitudinal wave in steel, c) the speed of propagation of a transverse wave in a tensioned wire, when the tension of the wire is 80 N and the length mass is 2.5 g/m and d) the transverse wave propagation speed of wave motion in steel.   A and B I got it but C and D only blank in my head.

Write P if only statement A is correct, H if only statement B is correct, Y if both statements are correct and S if both statements are incorrect. 1. A. Waves are created by vibrations. B. As wave moves through a medium, the individual particles of the medium move from the source of the wave to another location some distance away 2. A. Doubling the frequency of a wave source (without altering the medium) doubles the speed of the wave. B. Amplitude and frequency affects the energy of a wave. 3. A. High frequency waves are far apart and low frequency waves are close together. B. X-ray waves are low energy waves. 4. A. You cannot reflect all waves. B. All waves are visible. 5. A. During refraction, a wave bends because it hits the edge of a barrier. B. As a wave changes media, its speed changes.

3. The frequency of a tornado siren is 1,000 Hz. If a cyclist is moving toward the siren at 10 m/s in 15 °C air, which has a speed of sound of 340 m/s, what is the frequency that the cyclist observes? V=V f = f obs source V=V Sobe = ? I source V source questions continued on next page Unit 6C Practice Problems Copyright 2018 Georgia Public Broadcasting. All rights reserved. Use or distribution by an unintended recipient is prohibited.

A transverse wave is traveling left to right. Which of the following is correct about the motion of particles in the wave?  a. The particles move up and down when the wave travels in a vacuum.  b. The particles move left and right when the wave travels in a medium.  c. The particles move up and down when the wave travels in a medium.  d. The particles move right and left when the wave travels in a vacuum.

Two rocks are simultaneously dropped into a pond, creating the ripples shown. As they overlap, the ripples interfere. At the point marked with a dot, A. The interference is constructive. B. The interference is destructive. C. The interference is somewhere between constructive and destructive. D. There's not enough information to tell about the interference. What is the extra distance As traveled by one wave to the dot compared to the other? Α. Ο C. A 31 D. F. 4 5A B. E. 21 R, R, R I2 I3 Select all loop rules that apply to this circuit. SELECT ALL THAT APPLY A. 0 = -V +1,R2 – 1R1 B. 0 = V2 – 13R3- lR2 – Vị C. 0 = 4R1 – V2 – I3R3 D. 0 = -V – 1R2 + I¼R1 E. 0 = -V2 – I3R3 + 1½R2 +V1 F. 0 = 1, R, +V2 + I,R3 G. 0 = -V +I,R2 + I,Rq H. 0 = V2 + I3R3 + 1,R2 – V1 I. 0 = 1,R1 - V2 + I3R3 J. 0 = -V- I½R2 + I, R1 K. 0 = -V2 + I3R3 + 12R2 - V2 L. 0 = -1,R – V½ – 13R3 wwT ww

QUESTION 6 A tranverse wave in a medium wave is described by the following equation: y(x,t) = (12 m)cos(3.0x - 120t). What is the speed of this wave? (x and y describe real space with units of meters, and t is time in seconds.) а. 60 m/s b. 70 m/s С. 50 m/s d. 30 m/s e. 40 m/s

6. Oscillations and sounds:a.A wave with wavelength 27 m and time between crests of 0.5 s is traveling in water. What is wavelength, frequency,period, and the wave speed? b. You blow into one end close pipe and produce a tone. Explain what happens to the frequency of the tone if you open both ends of the pipe and blow into it again? c. A car moving away from you at the speed of 50.0 m/s while you are standing on the sidewalk. The engine produces sound at 27 Hz and the speed of sound is 340 m/s. What is the frequency you hear?

3. Examine the following wave. It takes the wave 5.0s to move the 3.5m from X to Y. wave motion a) b) c) d) àX Find the amplitude of the wave. Find the period of the wave. Find the frequency of the source. Find the wavelength of the wave. Find the speed of the wave. 1.5m Y

Two waves travelling at the same speed. Which statements about the figure below are correct?   Group of answer choices Double the amplitude of a double the speed it travels. Amplitude of a is twice the amplitude of b. A has a lower frequency than b. A has a higher frequency than b. Amplitude of a is half the amplitude of b.

Select all of the following statements which are true about transverse and longitudinal wave (Select all that apply) A. Transverse waves can move through solid, liquids and gasses. B. Longitudinal waves can move through solid, liquids and gasses. C. Transverse waves can only move through solids D. Longitudinal waves can only move through solids. E. Transverse waves can only move through liquids. F. Longitudinal waves can only move through liquids. G. Transverse waves can only move through gasses. H. Longitudinal waves can only move through gasses.