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Answers
Answer:
I think answer is option (a) for all three questions.
Explanation:
34)Carbon dioxide passed into limewater gives a milky solution. This is due to the insoluble suspension of calcium carbonate formed: Ca(OH)2(aq) + CO2(g) → CaCO3(s) + H2O(l) ... The milkiness appears since calcium bicarbonate is water-soluble.
35)According to law of energy transfer at trophic levels, only 10% energy is available for transfer to next trophic level.
36)Stars twinkle because they’re so far away from Earth that, even through large telescopes, they appear only as pinpoints. And it’s easy for Earth’s atmosphere to disturb the pinpoint light of a star. As a star’s light pierces our atmosphere, each single stream of starlight is refracted – caused to change direction, slightly – by the various temperature and density layers in Earth’s atmosphere. You might think of it as the light traveling a zig-zag path to our eyes, instead of the straight path the light would travel if Earth didn’t have an atmosphere.
Planets shine more steadily because they’re closer to Earth and so appear not as pinpoints, but as tiny disks in our sky. You can see planets as disks if you looked through a telescope, while stars remain pinpoints. The light from these little disks is also refracted by Earth’s atmosphere, as it travels toward our eyes. But – while the light from one edge of a planet’s disk might be forced to “zig” one way – light from the opposite edge of the disk might be “zagging” in an opposite way. The zigs and zags of light from a planetary disk cancel each other out, and that’s why planets appear to shine steadily.
Answer:
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