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Reflection of Waves01:07

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When a wave travels from one medium to another, it gets reflected at the boundary of the second medium. A common example of this is when a person yells at a distance from a cliff and hears the echo of their voice. The sound waves (longitudinal waves) traveling in the air are reflected from the bounding cliff. Similarly, flipping one end of a string whose other end is tied to a wall causes a pulse (transverse wave) to travel through the string, which gets reflected upon reaching the wall. In...
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Sometimes waves do not seem to move; rather, they just vibrate in place. Unmoving waves can be seen on the surface of a glass of milk kept in a refrigerator, which is one example of standing waves. Vibrations from the refrigerator motor create waves on the milk that oscillate up and down but do not seem to move across the surface. These waves are formed or created by the superposition of two or more identical moving waves in opposite directions. The waves move through each other, with their...
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Sound waves, which are longitudinal waves, can be modeled as the displacement amplitude varying as a function of the spatial and temporal coordinates. As a column of the medium is displaced, its successive columns are also displaced. As the successive displacements differ relatively, a pressure difference with the surrounding pressure is created. The gauge pressure varies across the medium.
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Sound Waves01:01

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Sound waves can be thought of as fluctuations in the pressure of a medium through which they propagate. Since the pressure also makes the medium's particles vibrate along its direction of motion, the waves can be modeled as the displacement of the medium's particles from their mean position.
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A wave is a disturbance that propagates from its source, repeating itself periodically, and is typically associated with simple harmonic motion. Mechanical waves are governed by Newton's laws and require a medium to travel. A medium is a substance in which a mechanical wave propagates, and the medium produces an elastic restoring force when it is deformed.
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The human ear is not equally sensitive to all frequencies in the audible range. It may perceive sound waves with the same pressure but different frequencies as having different loudness. Moreover, the perception of sound waves depends on the health of an individual's ears, which decays with age. The health of one's ears may also be affected by regular exposure to loud noises.
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A word from wales.

Lorraine Morgan1

  • 1Gerontology and community care at the Open University in Wales, Cardiff.

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Summary
This summary is machine-generated.

A new commissioner for older people in Wales will be appointed. This independent role will ensure elderly citizens receive basic human rights, including protection from abuse and discrimination.

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Area of Science:

  • Public Health
  • Social Policy
  • Gerontology

Background:

  • Older people in Wales require enhanced protection of their fundamental human rights.
  • Existing frameworks may not adequately address discrimination, access to services, and abuse prevention for the elderly.

Purpose of the Study:

  • To announce the forthcoming introduction of a bill establishing a commissioner for older people in Wales.
  • To outline the intended functions and responsibilities of the independent commissioner role.

Main Methods:

  • Legislative process: introduction of a draft bill for pre-legislative scrutiny.
  • Policy development: confirmation by the Secretary of State for Wales.

Main Results:

  • A draft bill will be introduced into parliament early this year.
  • An independent commissioner for older people could be appointed in 2007.

Conclusions:

  • The establishment of a commissioner signifies a commitment to safeguarding the rights of older individuals in Wales.
  • The commissioner will play a crucial role in ensuring freedom from discrimination, access to health and social services, and protection from abuse for the elderly.