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dbwlsgur
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$15.00 help me

From Computer-Science: General-CS
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Due on Nov. 07, 2009
Asked on Nov 06, 2009 at 11:39:20PM

Q:

1. Suppose that a certain sound has a period of 3msec.   What is the minimum sampling rate we can use to digitize this sound if we intend to reconstruct it perfectly? Explain your answer and show your work.

2. Suppose that Alice screams with a frequency of 10kHz. She is standing 10 metres from Bob when she screams, and it takes him 2msec to hear her. What is the wavelength of her scream? Explain your answer and show your work.



3. How much storage is needed to record a normal telephone call of one hour in duration? Explain your answer and show your work.



4. Explain why some third world nations have basically “skipped” wired phones, adopting wireless phone systems without any previous wired system.

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cbr2
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Posted on Nov 07, 2009 at 05:15:07PM

A:
Preview: ... metres from Bob when she screams, and it takes him 2msec to hear her. What is the wavelength of her scream? Explain your answer and show your work. We know the frequency. We know the distance. We know how long it takes Bob to hear her. How do we use what we know to find the wavelength? Use this formula: velocity = wavelength x frequency velocity = 10 m / 2 m sec OR 0.5 m / sec frequency = 10 kHz OR 10,000 Hz Now rearrange the formula to put wavelength on its own side: velocity / frequency = wavelength Now plug in the values and solve it. wavelength = 0.5 / 10000 wavelength = 0.00005 m This site has a form that does the math for you: http://www.ajdesigner.com/phpsound/sound_wave_equation_length_wavelength.php This is what it says and it is similar to what we got: wave ...

The full tutorial is about 634 words long .