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Re: A certain musical scale has has 13 notes, each having a [#permalink]

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26 Jul 2013, 05:50

Bunuel wrote:

dasikasuneel wrote:

Pushpinder wrote:

A certain musical scale has has 13 notes, each having a different frequency, measured in cycles per second. In the scale, the notes are ordered by increasing frequency, and the highest frequency is twice the lowest. For each of the 12 lower frequencies, the ratio of a frequency to the next higher frequency is a fixed constant. If the lowest frequency is 440 cycles per second, then the frequency of the 7th note in the scale is how many cycles per second?

A. 440 * sqrt 2 B. 440 * sqrt (2^7) C. 440 * sqrt (2^12) D. 440 * the twelfth root of (2^7) E. 440 * the seventh root of (2^12)

Lowest frequency = 440 Highest frequency = 880 Lowest frequency (n) ^12 = Highest frequency N^12 = 2 ---------------- 1 7th note = Lowest Frequency x (n)^6 7th note = 440 x (2)^6/12 Hence the answer is A

Pushpinder Ji I couldn't understand from here. Can u tell me please

Re: A certain musical scale has has 13 notes, each having a [#permalink]

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24 Sep 2013, 20:12

In a geometric progression, the median is the geometric mean given by SQRT (First * Last). Here, First is 440, Last is 2*440 = 880 and 7th Note is the median, so it's value = SQRT (440*880) = SQRT (440*440*2) = 440*SQRT(2) A is correct.

Re: A certain musical scale has has 13 notes, each having a [#permalink]

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30 Jan 2015, 12:06

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Re: A certain musical scale has 13 notes, each having a [#permalink]

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15 Apr 2015, 08:07

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Re: A certain musical scale has has 13 notes, each having a [#permalink]

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15 Apr 2016, 11:53

Hello from the GMAT Club BumpBot!

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Re: A certain musical scale has has 13 notes, each having a [#permalink]

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27 Apr 2016, 09:26

Is this an exponential growth problem? (Since we used the y(t)=y(0)*k^t formula). Also does someone have a link to similar questions for practice? Any help will be greatly appreciated, Thank you.

Re: A certain musical scale has has 13 notes, each having a [#permalink]

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05 Jul 2017, 21:16

Hello from the GMAT Club BumpBot!

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