. The Ontario high school physics. head will they all step together ? 9. A man standing before a precipice shouts, and 3 seconds afterwardshe hears the echo. How far away is the precipice ? (Temperature, 15° C.) 10. In 1826 two boats were moored on Lake Geneva, Switzerland, one on each side of the lake, 44,250 feet apart. One was supplied with a bell B (Fig. 211a), placed under water, so arranged that at the moment it was struck a torch m lighted some gunpowder in the pot P. The sound was heard at tlie other boat by an observer with a watch in his hand and his ear to an ear-trumpet, the bell o
. The Ontario high school physics. head will they all step together ? 9. A man standing before a precipice shouts, and 3 seconds afterwardshe hears the echo. How far away is the precipice ? (Temperature, 15° C.) 10. In 1826 two boats were moored on Lake Geneva, Switzerland, one on each side of the lake, 44,250 feet apart. One was supplied with a bell B (Fig. 211a), placed under water, so arranged that at the moment it was struck a torch m lighted some gunpowder in the pot P. The sound was heard at tlie other boat by an observer with a watch in his hand and his ear to an ear-trumpet, the bell of which was in the sound was heard seconds after the flash was seen. Calculate thevelocity of sound in water. 11. In a Kundts tube a brass rod is 1 m. long, and five of the intervalsbetween the dust-heaps equal cm. Find the velocity of sound in brass. 12. When a Kundts tube is filled with hydrogen the dust-heaps are as far apart as with air. Find the velocity of sound in hydrogen.(Temperature, 20° C.).
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