Science & Mathematics Questions & Answers

Science & Mathematics Questions & Answers

How is an atom’s mass measured?

The atomic mass of a specific atom or molecule is determined by using an experimental technique called mass spectrometry. This technique separates different isotopes of atoms to allow determination of the percent abundance or isotopic composition of the element in the given sample. Each isotope of the element appears as a peak in the mass spectrum. The intensity (height) of …

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How is a satellite phone different from a cellular phone?

Satellite and cellular phones are wireless devices. They almost look alike but the way they work is totally different. A cellular phone functions on the basis of cells, and hence are called cell phones. The whole network area is divided into small areas and an antenna is installed in each area. These are also called towers. When a cellular phone …

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How high can waves reach?

The waves that break on the seashore are usually caused by winds blowing across the open sea. During storms, waves reach 12m (39 ft) or more in height. The highest wave recorded in the open sea was 34m (112ft) high. Other large and often destructive waves, called tsunamis, are triggered off by earthquakes or volcanic eruption. They are low, fast …

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How fast does ice move on land?

Bodies of ice, ranging from vast ice sheets to valley glaciers move downhill because of gravity. In Antarctica the ice sheet moves by only a metre (39in) or so a year, while most valley glaciers move the same distance in a day. Special circumstances can speed up the movement of the ice. In 1936-37, Alaska’s Black Rapids Glacier moved downhill …

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How far can a telescope see?

Telescopes are like time machines. The father off in space they look, the farther back in history they go, because of the time that light takes to reach us from distant objects. The farthest galaxies and quasars visible in the Universe are so far away that their light has taken over 10,000 million years to reach us. Therefore we see …

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How far away are the stars?

Stars are too far away to use kilometers or miles to measure their distances, so astronomers use light-years instead. One light-year is nearly 10 million million km, and the nearest star, Proxima Centauri, is 4.25 light-years distant. The farthest heavenly bodies are at the unimaginahble distance of 8,000 million light-years! As the earth moves around the sun, the nearer stars …

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How does the Secretary bird catch snakes?

The Secretary bird prefer to walk around looking for its prey rather than to fly. As a result its feet are less adapted for killing. The Secretary bird strides around African grasslands on its long legs hoping to disturb its prey. It catches insects, small mammals and lizards, but it is best known for eating snakes. It attacks a snake …

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How does the sea from a ‘below hole’?

In stormy weather, powerful waves hurl loose rocks at the shore, undercutting cliffs. While soft rocks are worn back to form bays, hard often survive as headlands in which waves then hollow out caves. If the roof of a cave collapses, a ‘blow hole’ is formed in the ground above. When waves break in the cave, clouds of spray burst …

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