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# Problem_Set_2.pdf

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McMaster University

Psychology

PSYCH 3A03

Paul Faure

Fall

Description

Psych 3A03 22 September 2013
McMaster University Paul A. Faure
Instructions and Tips
• The speed of sound in air (c ) iair 340 m⋅s ; the speed of sound in water (c water is = 4⋅cair
• Remember that log (2) 100.3.
• A calculator is not necessary to answer any of these questions.
1. Write the equation for a line with a slope of 1, 3 and 5, each having a y-intercept equal to its slope.
(a) Line 1:
(b) Line 2:
(c) Line 2:
2. Draw the unit circle andlabelpointsatevery
π/4 radians starting from x=1, y=0. What angle
(θ) in degrees corresponds to each π/4 radian
point starting from x=1, y=0?
3. (a) Write the equation that describes the instantaneous pressure, P(t) , of a sine wave with a peak
amplitude of 4 Pascals (Pa), a period (T) of 1 ms, and a starting phase angle (θ) of 3.14 radians (rad).
(b) Write the equation for the instantaneous pressure of the above sound if the frequency (f) is doubled
and the starting phase angle (θ) is shifted by -90°.
(c) Write the equation that describes the instantaneous pressure, P(t) , of a sine wave with a peak
amplitude of 0.01 Pa, a frequency (f) of 5000 Hz, and a starting phase angle (θ) of 270°.
Problem Set #2 page 1 of 3 Psych 3A03 22 September 2013
McMaster University Paul A. Faure
4. What is the period (T)

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