Vibrations and Waves 1) A wiggle in time is a A) vibration. B) wave. C) both D) neither Answer: A Diff: 1 Topic: Vibrations and Waves 2) A common source of wave motion is a A) wave pattern. B) harmonic object. C) vibrating object. D) region of variable high and low pressure. E) none of these Answer: C Diff: 1 Topic: Vibrations and Waves 3) Like
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inexpensive‚andsafesoisoftenthefirstchoiceof a medical imaging method where feasible Sound waves • Sound wave propagate by longitudinal motion (compression/expansion)‚ but not transverse motion (side-to-side) • Can be modeled as weights connected by springs 1Ultrasonic Waves and properties • Mechanical waves are longitudinal compression waves • “Ultrasound” refers to frequencies greater than 20kHz‚ the limit of human
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Electromagnetic waves in space See the book “Optics” by Hecht sections 3.2 and 3.3 Speed of light: EM waves travel in a vacuum with speed c = c = 299‚792‚458 ms-1 exactly They are transverse waves with (vector) E and B field orthogonal to each other‚ for this section bold indicates vector quanties. When far from the source (many wavelengths) the E and B fields are in phase The vector E x B points in the direction of motion Travelling waves can be written as E = E 0 ⋅ ei ( kx −ωt ) and B = B 0 ⋅ ei
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Characteristics and Nature of Waves In physics‚ a wave is a disturbance that travels through space and time‚ usually accompanied by the transfer of energy. Waves travel and the wave motion transfers energy from one point to another‚ often with no permanent displacement of the particles of the medium—that is‚ with little or no associated mass transport. They consist‚ instead‚ of oscillations or vibrations around almost fixed locations. For example‚ a cork on rippling water will bob up and down
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Beginning in the summer of 1869 Gustave Courbet produced a series of paintings depicting stormy seas during his stay at Etretat on the Normandy coast. The Wave (La Vague c.1872) exhibited in the National Gallery of Victoria is one such painting that features the central motif of a cresting wave. While many viewed the work as a simple realist seascape‚ the political implication of the work suggested by some of Courbet’s contemporaries is hardly discernable to the modern viewer. It can only be understood
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Electromagnetic Waves It was once the great Scottish physicist James Clerk Maxwell (1831-1879) who had presented that electric and magnetic fields unstable together can form a spreading wave‚ appropriately called an electromagnetic wave. The properties of an electromagnetic wave are as follows: 1. They can travel through a vacuum at the same high speed‚ which is much faster than other types of waves that travel through a material. 2. They show the normal wave properties of reflection‚ refraction
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Do you think being asleep at 10 p.m. is normal? “No!”‚ is what most teenagers would say because that time is ridiculously early. Most high school and middle school students regularly finish up work late at night because they don’t have time during the day. This curfew for bedtime is exactly alike the curfew for being out on the streets. Without the access to the streets at 10 p.m.‚ teenagers are limited to the amount of work they can do. For example‚ if a teenager got hired for a job‚ but the only
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bodies of water. Tides are caused by the gravitational interaction between the earth and the moon. Tides are the cyclic rising and falling of earth’s ocean surface caused by the tidal forces of the moon and the sun acting on the earth . Tides cause changes in the depth of the sea and produce oscillating currents known as tidal streams‚ making prediction of tides important for coastal navigation. The strip of seashore that is submerged at high tide and exposed at low tide‚ the intertidal zone ‚ is an
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Rogue Waves For centuries‚ mariners have spread stories about giant sudden waves which appeared out of nowhere without warning which were strong enough to capsize even the mightiest and largest ships. Several vessels—such as the S.S. Waratah‚ the M.S. Munchen‚ and the S.S. Edmund Fitzgerald—were all rumored to have been sunk by rogue waves (Walsh par. 3). Further‚ rogue waves have been blamed for ripping the bow off of a Norwegian freighter near the tip of South Africa in 1974‚ almost capsizing
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Water Waves By Anna Introduction Water waves have been around for years; learning about water waves can help you understand the outside world. Water waves can be used in many ways‚ but they can also be harmful‚ too. When were they discovered? Water waves have been around since the creation of the earth‚ but Isaac Newton came up with a theory; after studying waves in about 1687. What is the biggest wave? In 1958 the biggest tsunami wave was recorded. How much harm can water waves really
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