The sound from a vibrating tuning sound is when the tip of its stem is placed on a wooden table than when in air because?
A. the friction between the table and the tuning fork generates additional energy B. air molecules obsorb sound wave but wood transmit sound waves C. the table increases the frequency of the turning fork D. a large mass of air is set into vibration by the table...During a thunderstorm, lightning and thunder occurred simultaneously in the atmosphere. An observer on the earth surface’s sees the lightning flash shortly before hearing the thunder. This is because the.
A. atmospheric pressure is higher at the surface than at the higher altitudes B. speed of sound is less than that of light C. temperature of the atmosphere decreases with altitude D. atmospheric density decreases with altitude Correct Answer: Option B B. speed of...A magnified and virtual image of a near object is produced by?
A. prism binoculars B. astronomical telescope C. periscope D. simple microscope Correct Answer: Option D D. simple microscopeA man 1.8m tall stands 3m away from a pin hole camera. If the distance between the pin hole and the screen of the camera is 0.3m. Calculate the height of the image of the man produced by the camera?
A. 0.18m B. 0.50m C. 1.62m D. 18.00m Correct Answer: Option A B. 0.50m Explanation hi = ho×vu=(1.8×0.3)/3 = 0.18mProducts
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