Search found 7 matches

by Darkmatter7
January 19th, 2019, 5:35 pm
Forum: General Competition
Topic: Science Olympiad Events 2019-2020
Replies: 557
Views: 107779

Re: Science Olympiad Events 2019-2020

Is there any chance Ornithology might change to a binder event?
by Darkmatter7
September 9th, 2018, 7:27 pm
Forum: 2019 Question Marathons
Topic: Sounds Of Music C
Replies: 120
Views: 15058

Re: Sounds Of Music C

Alright, since nothing seems to be happening let me give this thread a kick. Question: This is a monochord: http://www.trombamarina.com/img/usr/monochord-monochord.jpg It is a instrument composed of a single resonating box and a single string. Different notes can be played by adjusting the tension ...
by Darkmatter7
September 6th, 2018, 8:20 am
Forum: 2019 Question Marathons
Topic: Sounds Of Music C
Replies: 120
Views: 15058

Re: Sounds Of Music C

A Solid has a bulk modulus of 2.3 × 10^7 N/m^2 and a density of 8.05 g/cm^3. What is the speed of sound in this solid?
by Darkmatter7
September 5th, 2018, 6:39 pm
Forum: 2019 Question Marathons
Topic: Sounds Of Music C
Replies: 120
Views: 15058

Re: Sounds Of Music C

goblinrum wrote:
Darkmatter7 wrote:
Darkmatter7 wrote: So the fundamental frequency is equal to 2/1 Length. 65 cm * 2 = 130. 343 m/s = 1.3 m * frequency. After calculating, I got ~364 Hz.
Sorry, forgot to tell you that you got the correct answer on my question :D
Did you just do (343 m/s) / 1.3 m is 364Hz????
264Hz. I miss typed -.-
by Darkmatter7
September 5th, 2018, 6:23 pm
Forum: 2019 Question Marathons
Topic: Sounds Of Music C
Replies: 120
Views: 15058

Re: Sounds Of Music C

Hi there, here is my answer: forgive my formatting Answer|dB = 10 log I / I (threshold intensity ) = 10 log 4(1 x 10^-4 W/m^2) / 1 x 10^-12 W/m^2 = 86dB, so final is 86dB Here is my question : A soprano saxophone is considered an open pipe resonator. If the pipe was straightened out it would be 65 ...
by Darkmatter7
September 5th, 2018, 6:22 pm
Forum: 2019 Question Marathons
Topic: Sounds Of Music C
Replies: 120
Views: 15058

Re: Sounds Of Music C

Hi there, here is my answer: forgive my formatting Answer|dB = 10 log I / I (threshold intensity ) = 10 log 4(1 x 10^-4 W/m^2) / 1 x 10^-12 W/m^2 = 86dB, so final is 86dB Here is my question : A soprano saxophone is considered an open pipe resonator. If the pipe was straightened out it would be 65 ...
by Darkmatter7
September 5th, 2018, 5:54 pm
Forum: 2019 Question Marathons
Topic: Sounds Of Music C
Replies: 120
Views: 15058

Sounds Of Music C

Welcome to the 2018-2019 season! I'll start with some basics:

A speaker produces a sound with an intensity of 1 x 10^-4 W/m^2. What is the intensity, in decibels, of the sound produced by 4 of these speakers?

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