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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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
A) 1/4 the weight. B) 1/2 the weight. C) practically the same weight.
Why does detection of abundant free oxygen in an atmosphere suggest life is present? Does its absence prove life could not be present?
What will be an ideal response?
What is the nearest huge cluster of thousands of galaxies, to which the Local Group may belong?
A) The Great Wall B) Virgo Cluster C) Sagittarius Cluster D) Corona Borealis Cluster E) Coma Cluster
A device that measures absolute air pressure is called a
a. manometer. b. barometer. c. thermometer. d. tire gauge. e. none of the above