Question

⦁ A person sitting in a stationary boat notices that it takes the water waves 2 seconds to pass the entire length of the boat that is 12 m. Calculate the speed of the water waves. Show your calculation.

12/2 = 6m/s

⦁ The person in Question #1 also notices the water
waves passing by the bow of the ship once every 4 seconds. b) What
are the frequency and c) the wavelength of the water waves? Show
all your calculations.

⦁ Describe what happens to the fundamental frequency of
a guitar string when the string is loosened? Cite evidence from the
lab activities.

⦁ How many nodes and how many antinodes are there when
the spring oscillates in each of its first 3 harmonic modes? (Refer
to Figure 1.) Complete the table below.

Harmonic 1st 2nd 3rd

Node #

Antinode #

⦁ A violin string is oscillating at a frequency of 880 Hz (1 Hz = 1 full cycle / second) in its 2nd harmonic. What would be the frequency of the fundamental vibrational mode?

⦁ The audible range of human hearing is roughly from
about 20 Hz to 20000 Hz. Calculate the wavelengths of sound waves
at these two frequencies. (Assume T = 25.0 °C.)

⦁ Suppose you send out two different frequencies that
reflect off a wall on the opposite side of the room. One frequency
is 100 Hz and the other is 1000 Hz. Which (if either) will echo
back to the microphone the fastest? Cite evidence from the lab
activities.

⦁ Consider the three waveforms (A, B, C) shown
below.

(A)
(B)
(C)

a) Which waveform has the greatest frequency?

(b) Which waveform has the greatest amplitude?

9. Using the average speed that you calculated for the
speed of sound in air from just one of Tables (4-7)
and the formula for the temperature dependence of the actual
speed of sound in air:

,

calculate the temperature of the “air” the simulation of Part III. Show your calculation

Answer #1

a) A 1 meter long guitar string of linear mass density 2g/m3 is
put under tension until it resonates with a fundamental frequency
of 440 Hz. Determine the tension that produces this fundamental
frequency. Also determine the other of the first four harmonic
frequencies and draw diagrams illustrating what each of these
oscillations looks like on the string.
b) This string will produce sound waves in the air, determine
the wavelength of the sound waves.
c) Suppose you had two...

A stone is dropped from the top of a cliff. The splash it makes
when striking the water below is heard 3.2 s later. How high is the
cliff?
2. The pressure variation is a sound wave is given by Δ P =
0.0035 sin (0.38 π x – 1350 π t) Determine a. the wavelength b. the
frequency c. the speed and d. the displacement amplitude of the
wave. Assume the density of the medium to be 2.2 x...

Short Answers Conceptual Questions
1. (a) A lead cylinder floats in mercury at 0oC. Will the lead
float higher or lower if the temperature is raised? (b) Freezing a
can of soda will cause its bottom and top to bulge so badly that
the can will not stand up. What has happened?
2. (a) Is it possible to boil water at room temperature (20oC)
without heating it? Explain. (b) Explain why burns caused by steam
at 100oC on the skin...

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