Mastering Physics Solutions: Sound Waves Traveling Down a String

Mastering Physics Solutions: Sound Waves Traveling Down a String

On November 28, 2013, in Chapter 13: Vibrations and Waves, by Mastering Physics Solutions

Part A = 0.26 s

If the string is 9.5 m long, has a mass of 55 g and is pulled taut with a tension of 7.5 N, how much time does it take for a wave to travel from one end of the string to the other?

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Mastering Physics Solutions: Is Light Reflected or Refracted?

Mastering Physics Solutions: Is Light Reflected or Refracted?

On May 24, 2013, in Chapter 24: Physical Optics: The Wave Nature of Light, by Mastering Physics Solutions

Part A = Increases
Part B = +1
Part C = θ2 > θ1
Part D = θ2 < θ1
Part E = Just pick the material with the greatest index of refraction
Part F = Increases up to a maximum value of 90 degrees.
Part G = 0.7297 radians

When light propagates from a material with a given index of refraction into a material with a smaller index of refraction, the speed of light
What is the minimum value that the index of refraction can have?
etc …

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Mastering Physics Solutions: The Decibel Scale

Mastering Physics Solutions: The Decibel Scale

On May 24, 2013, in Chapter 14: Sound, by Mastering Physics Solutions

Part A = 10 dB
Part B = 20 dB
Part C = 3,6,9 dB

What is the sound intensity level Β, in decibels, of a sound wave whose intensity is 10 times the reference intensity (i.e., I = 10I0)?
What is the sound intensity level Β, in decibels, of a sound wave whose intensity is 100 times the reference intensity (i.e., I = 100I0)?
Calculate the change in decibels (ΔΒ2, ΔΒ4, and ΔΒ8) corresponding to f = 2, f = 4, and f = 8.

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Mastering Physics Solutions: Two Identical Pulses along a String

Mastering Physics Solutions: Two Identical Pulses along a String

On May 18, 2013, in Chapter 13: Vibrations and Waves, by Mastering Physics Solutions

Part A = E

Two identical pulses are moving in opposite directions along a stretched string that has one fixed end and the other movable, as shown in the figure. Initially, the pulses are moving away from each other.
Which sequence correctly represents the displacement of the string as the pulses interfere?

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Mastering Physics Solutions: Polarization of Light and Malus’s Law

Mastering Physics Solutions: Polarization of Light and Malus’s Law

On May 18, 2013, in Chapter 24: Physical Optics: The Wave Nature of Light, by Mastering Physics Solutions

Part A = θTA – θ0
Part B = θTA
Part C = 18.7 W/m2
Part D = I0 = 2I = 5.81760
Part E = I2 = 0I0 = 0
Part F = See below

A beam of polarized light with intensity I0 and polarization angle θ0 strikes a polarizer with transmission axis θTA. What angle θ should be used in Malus’s law to calculate the transmitted intensity I1?

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Mastering Physics Solutions: Resolving Pixels on a Computer Screen

Mastering Physics Solutions: Resolving Pixels on a Computer Screen

On May 6, 2013, in Chapter 24: Physical Optics: The Wave Nature of Light, by Mastering Physics Solutions

Part A = d = 3.10 mm
Part B = d = 1660 m

A standard 14.16-inch (0.360-meter) computer monitor is 1024 pixels wide and 768 pixels tall. Each pixel is a square approximately 281 micrometers on each side. Up close, you can see the individual pixels, but from a distance they appear to blend together and form the image on the screen.
If the maximum distance between the screen and your eyes at which you can just barely resolve two adjacent pixels is 1.30 meters, what is the effective diameter d of your pupil?
Assuming the screen looks sufficiently bright, at what distance can you no longer resolve two pixels on diagonally opposite corners of the screen, so that the entire screen looks like a single spot?

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