Sound waves of a certain frequency in air having a wavelength of 1.9 m will have what wavelength in water? Take the speed of sound in air to be 340 m/s and in water to be 1 490 m/s
a. 0.57 m b. 1.9 m
c. 8.3 m d. 11 m
c
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What is the nearest huge cluster of thousands of galaxies, to which the Local Group may belong?
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The force of gravity acts on all apples on an apple tree. Some apples are twice as far from the ground as others. For the same mass these twice-as-high apples have
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