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  2. Transverse wave - Wikipedia

    en.wikipedia.org/wiki/Transverse_wave

    In physics, a transverse wave is a wave that oscillates perpendicularly to the direction of the wave's advance. In contrast, a longitudinal wave travels in the direction of its oscillations. All waves move energy from place to place without transporting the matter in the transmission medium if there is one.

  3. dBm - Wikipedia

    en.wikipedia.org/wiki/DBm

    Maximal output from a UMTS/3G mobile phone (power class 4 mobiles) 20 dBm: 100 mW: EIRP for IEEE 802.11b/g wireless LAN 20 MHz-wide channels in the 2.4 GHz Wi-Fi/ISM band (5 mW/MHz). Bluetooth Class 1 radio. Maximal output power from unlicensed AM transmitter per US FCC rules 15.219 [14] 19 dBm: 79 mW: 18 dBm: 63 mW: 17 dBm: 50 mW: 15 dBm: 32 mW

  4. Wave - Wikipedia

    en.wikipedia.org/wiki/Wave

    A plane wave is classified as a transverse wave if the field disturbance at each point is described by a vector perpendicular to the direction of propagation (also the direction of energy transfer); or longitudinal wave if those vectors are aligned with the propagation direction. Mechanical waves include both transverse and longitudinal waves ...

  5. Wilkinson Microwave Anisotropy Probe - Wikipedia

    en.wikipedia.org/wiki/Wilkinson_Microwave...

    The other confirmation of major significance is of the total amount of matter/energy in the universe in the form of dark energy – 72.8% (within 1.6%) as non 'particle' background, and dark matter – 22.7% (within 1.4%) of non baryonic (sub-atomic) 'particle' energy. This leaves matter, or baryonic particles (atoms) at only 4.56% (within 0.16%).

  6. List of gravitational wave observations - Wikipedia

    en.wikipedia.org/wiki/List_of_gravitational_wave...

    Known gravitational wave events come from the merger of two black holes (BH), two neutron stars (NS), or a black hole and a neutron star (BHNS). [ 9 ] [ 10 ] Some objects are in the mass gap between the largest predicted neutron star masses ( Tolman–Oppenheimer–Volkoff limit ) and the smallest known black holes.

  7. Physics - Wikipedia

    en.wikipedia.org/wiki/Physics

    Physics is the scientific study of matter, its fundamental constituents, its motion and behavior through space and time, and the related entities of energy and force. [1] Physics is one of the most fundamental scientific disciplines. [2] [3] [4] A scientist who specializes in the field of physics is called a physicist. Physics is one of the ...

  8. Photon - Wikipedia

    en.wikipedia.org/wiki/Photon

    The energy of a system that emits a photon is decreased by the energy of the photon as measured in the rest frame of the emitting system, which may result in a reduction in mass in the amount /. Similarly, the mass of a system that absorbs a photon is increased by a corresponding amount.

  9. Idealized greenhouse model - Wikipedia

    en.wikipedia.org/wiki/Idealized_greenhouse_model

    It has since become a common introductory "textbook model" of the radiative heat transfer physics underlying Earth's energy balance and the greenhouse effect. [ 3 ] [ 4 ] [ 5 ] The planet is idealized by the model as being functionally "layered" with regard to a sequence of simplified energy flows, but dimensionless (i.e. a zero-dimensional ...

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