homework help: post closed, and help received =]

Anonymous1011

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post closed, and help received =]

PHYSICS HOMEWORK, Sound Waves

7d: What vibrates in a tape recorder during playback?

9a: A tuning fork is marked ‘440′. Explain what that means.
9b: Calculate the wavelength of the note emitted when soundingin air in which the speed of sound is 340 m/s.
9c: What happens to the sound as it passes through an open doorway of width 80cm.
9d: The tuning fork is struck harder. What difference, if any, does it make to (i) the frequency, and (ii) the loudness of the sound produced.

This closed post was written 1 year, 2 months ago | V/U/S: 266, 14, 2 | Edit Post | Report Post

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Since writing this post Anonymous1011 has helped in 2 other users' posts within the last 4 days. Anonymous1011 is a verified member, has been around for 1 year, 7 months and has 38 posts and 872 replies to their name.

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Piano, Recorder, Wave, Larynx, Sound, Human voice, Drum, Oscillation, speech, Tape recorder, physics, homework, soundwaves (How Tags Affect Reciprocity)

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Michael Leibman 3 #
Littleton, CO, US | 1 year, 2 months ago (29 minutes after post)

Piano is strings, taperecorder is a speaker cone.

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Anonymous1011 edited this post 1 year, 2 months ago. Read the previous text »

PHYSICS HOMEWORK, Sound Waves

7: All sounds are caused by vibrations. What is vibrating in each of the following: piano, drum, during talking, tape recorder during playback.

The drumskin vibrates (2), and the larynx (vocal chords) vibrates (3).

What about the other two?

thanks

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Michael Leibman 3 #
Littleton, CO, US | 1 year, 2 months ago (35 minutes after post)

This is actually interesting stuff. I bet wikipedia has a couple articles that could fill you in on what you don’t know fast enough.

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Anonymous1011 5 #
An Undisclosed Location | 1 year, 2 months ago (36 minutes after post)

uhhhh//if you could direct me to those articles it would be most helpfulll

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Anonymous1011 5 #
An Undisclosed Location | 1 year, 2 months ago (38 minutes after post)

oh i get 9b
wvlngth = S / f
= 340m/s / 440Hz

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spiratec9 11 #
Burnaby, BC, CA | 1 year, 2 months ago (2 hours, 15 minutes after post)

The tape recorder question is a trick question.
Because as Michael said he could be the speaker.
However it requires first that the magnetic material passing by the heads
vibrate in a magnetic field in the heads by magnetic induction.

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spiratec9 11 #
Burnaby, BC, CA | 1 year, 2 months ago (2 hours, 16 minutes after post)

In the tuning fork of 440 Hz.
The actual tynes are moving back and forth a very tiny amount
at a rate of 440 complete sinusoidal movements per second.

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spiratec9 11 #
Burnaby, BC, CA | 1 year, 2 months ago (2 hours, 16 minutes after post)

What happens to the sound as it passes through an open doorway of width 80cm.

This means your mothers calling you for dinner.

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spiratec9 11 #
Burnaby, BC, CA | 1 year, 2 months ago (2 hours, 18 minutes after post)

The tuning fork is struck harder. What difference, if any, does it make to (i) the frequency, and (ii) the loudness of the sound produced.

The amplitude increases. And the number of harmonics increases.
For the 400 Hz tuning fork. Harmonics are multiples of 400 Hz.
Second harmonic equals 800 Hz. Third harmonic equals 1200 Hz.
And so on. Probably not more than a third harmonic will be heard.

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Michael Leibman 3 #
Littleton, CO, US | 1 year, 2 months ago (2 hours, 37 minutes after post)

The wikipedia article http://en.wikipedia.org/wiki/Sound wasn’t as well-written as I expected it might be, but still somewhat informative. It did have a pleasant link off of it http://hyperphysics.phy-astr.gsu.edu/…

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Anonymous1011 5 #
An Undisclosed Location | 1 year, 2 months ago (2 hours, 46 minutes after post)

THANK YOU ALL SO MUCH!

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Anonymous1011 closed this post.

Anonymous1011 edited this post 1 year, 2 months ago. Read the previous text »

PHYSICS HOMEWORK, Sound Waves

7d: What vibrates in a tape recorder during playback?

9a: A tuning fork is marked ‘440′. Explain what that means.
9b: Calculate the wavelength of the note emitted when soundingin air in which the speed of sound is 340 m/s.
9c: What happens to the sound as it passes through an open doorway of width 80cm.
9d: The tuning fork is struck harder. What difference, if any, does it make to (i) the frequency, and (ii) the loudness of the sound produced.

Help me with: Can’t we just use the heat energy generated by laptops and computers?

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