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Monday, September 28, 2020

Reading and writing fill in the blanks practice exercise. Below is text with blanks. Choose the correct word for each blank to complete the text.

British physicist Lord (1) ……………………  is best known for his discovery of argon and for explaining, in 1871, why the sky is blue. But he also puzzled over this: Rayleigh knew that a kettle makes that sound when steam jets through the hole in a thick lid that has a gap in the middle. He speculated that jet becomes unstable inside that gap, setting up an acoustic feedback loop within a  gap. But he couldn’t prove it. Now two (2) ………………… at Cambridge University claim to have solved the puzzle—and proved Rayleigh wrong. The work is in the journal Physics of Fluids. The engineers found that a kettle (3) ……………… whistles in two (4) ………………… ways. It starts off with air vibrating in the gap between the layers of the lid, like when you do this and this [sound of whistling]. But as the (5) ………………… builds,(6) ………………. of steam peel off from the jet exiting lid. Each vortex creates sound waves at a frequency which depends on the length of the spout and the pressure inside it. Rising temperature means rising pressure, which (7) ……………….. a rising whistle. Which means it’s time for tea.

(1) Conveyer, Farmer, Scalar, Rayleigh
(2) blends, tics, engineers, delve
(3) actually, functionally, scandalously, symmetrically
(4) syringe, cent, unrest, distinct
(5) pressure, severe, provender, temper
(6) ogresses, soreness, vertices, haughtiness
(7) prudence, inducements, produces, tribunals

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