Home Culture: A Self-instructor and Aid to Social Hours at Home, Comprising New and Intellectual Entertainments in the Form of Test-exercises with Answers, in the Various Departments of Education ...Thomas Hunter E.B. Treat, 1884 - 672 من الصفحات |
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الصفحة 588
... sound , which alternately lengthens and shortens it . Corresponding to these changes the membrane of the telephone vibrates and gives out sound . It is so sensitive that the walking of a fly on the sounding - board may be heard . 54 ...
... sound , which alternately lengthens and shortens it . Corresponding to these changes the membrane of the telephone vibrates and gives out sound . It is so sensitive that the walking of a fly on the sounding - board may be heard . 54 ...
الصفحة 613
... sound ? SOUND . GIVE IT UP HOME GUITURE TEST EXERCISES . 2. What are the necessary conditions for the production and appreciation of sound ? 3. Can there be sound in the absence of an organ of hearing ? 4. Demonstrate how sound is the ...
... sound ? SOUND . GIVE IT UP HOME GUITURE TEST EXERCISES . 2. What are the necessary conditions for the production and appreciation of sound ? 3. Can there be sound in the absence of an organ of hearing ? 4. Demonstrate how sound is the ...
الصفحة 616
... sound - waves meet in exactly opposite phases , and the two forces are equal , they will balance each other and silence will ensue . 23. To collect and reflect a greater number of sonorous waves . 24. The reflection of sound . 25. They ...
... sound - waves meet in exactly opposite phases , and the two forces are equal , they will balance each other and silence will ensue . 23. To collect and reflect a greater number of sonorous waves . 24. The reflection of sound . 25. They ...
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