Recent content by ilona

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    K Concentration on Earth Over Time

    Homework Statement Hei!Half life of the reaction is about 1,25 billion years. Assuming that the age of Earth is 5 billion years,the concentration of K on Earth since its formation decreased: a)2times b)4times c)8 times d)16times The Attempt at a Solution So I just do like that...
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    Middle Ear Amplifies Sound Waves: 30dB Reduction

    ok, thank you very much =)
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    Middle Ear Amplifies Sound Waves: 30dB Reduction

    but once again , cause I don't think I understand it.. I have this formula LB=log10p1/p0 so I have 30 dB so it is 3 B and now why p1/po is 1?
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    Middle Ear Amplifies Sound Waves: 30dB Reduction

    ok , i think answer will be 1000times
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    Middle Ear Amplifies Sound Waves: 30dB Reduction

    log1= 0
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    Middle Ear Amplifies Sound Waves: 30dB Reduction

    L(B)=log10*I/Io but i wonder if there is no amplification we have 1 dB ,haven't we? so why is not it just reduced by 30 times?
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    Middle Ear Amplifies Sound Waves: 30dB Reduction

    logarithmic unit of ratio of intensity to standard threshold of hearing(10^-12) dB=log^10*I/Io
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    Middle Ear Amplifies Sound Waves: 30dB Reduction

    Homework Statement Hei! I have problem with this quest: Middle ear amplifies the sound waves entering cochlea by 30dB. This means that in case of total dysfunction of ossicles the sound energy transferred into cochlea is reduced: a)3 times b)30 times c)1000 times d)3000 times I don...