ממן 11 אנגלית למתקדמים ב למדעים קורס שמספרו 31001
לחזור ל: 8ב 11 – תרגם לוודא בעזרת תרגום:
9ב 12ב 6
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1 .         Hit water with a blast of sound and tiny bubbles start to glow.
Sonoluminescence, the conversion of sound into light
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2 .         a.
כי לגלי קול יש פחות אנרגיה מגלי אור.
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The pressure drops the liquid à The liquid boils The pressure forming a bubbleà the bubble begins to expandà  the pressure rises à The bubble is forced to collapse
1 .the gas inside it is greatly compressed
2 .the gas heated to a very high temperature à light is emitted.
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7.
הכימאים התרשמו מהעובדה שניתן להגיע באמצעות ציוד פשוט (נוזל ושדה קול) להגיע לטמפרטורה כה גבוהה 5
8 .a.
1. Evenly throughout the water.
2 .Concentrated as intense bands of light at certain points.
b.1. The sintense bands coincide with the regions where sound is most intense, in the acoustic "standing waves".
2. The light comes from so many different parts of a liquid that it must involve the collapse of many different bubbles.
10 9.a.
Because this discovery makes it possible to study sonoluminescence in much more detail than before.
b. (1). The forces associated with this standing wave try to move the bubble towards the strongest part of the sound field — that is, towards the middle of the container.
(2). The bubble is also trying to rise to the surface of the liquid because of its inherent buoyancy.
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1 0.
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