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# Physics Terms Quiz

### Get ready to have your mind blown with knowledge!

Question | Answer |
---|---|

Absolute humidity | The ratio of water vapor in a sample of air to the volume of the sample. |

Absolute zero | The temperature of - 273.16 or 0 K at which molecular motion vanishes. |

Absorptance | The ratio of the total absorbed radiation to the total incident radiation. |

Acceleration | The rate of change of velocity with respect to time. |

Acceleration due to gravity | The acceleration imparted to bodies by the attractive force of the earth or any other heavenly body. |

Achromatic | capable of transmitting light without decomposing it into its constituent colors. |

Acoustics | The science of the production, transmission and effects of sound. |

Zeeman Effect | The splitting of the spectral lines in a spectrum when the source is exposed to a magnetic field. |

Zeroth law of thermodynamics | If body A is in thermal equilibrium with body B, and B is also in thermal equilibrium with C, then A is necessarily in thermal equilibrium with C. |

Young's modulus of elasticity | The ratio of normal stress to the longitudinal strain produced in a body. |

Joule | The unit of work and energy, 1J = 1N-m. |

Joule's law of heating | The heat produced when a current 'I' flows through a resistor 'R' for a given time't' is given by Q =I2Rt. |

Quark | One of the hypothetical basic particles, having charges whose magnitudes are one-third or two-third of the charge on an electron. |

Quantum numbers | Numbers that describe energy states of an electron. |

Q unit | A unit of energy, used in measuring the heat energy of fuel reserves, equal to 1018 British thermal units, or approximately 1.055x1021 joules. |

Quantum mechanics | Model of the atom based on the wave nature of subatomic particles, the mechanics of electron waves; also called wave mechanics. |

Quantum limit | The shortest wavelength, present in a continuous x-ray spectrum. |

Quanta | Fixed amounts; usually referring to fixed amounts of energy absorbed or emitted by matter. |

Van der Wall's force | General term for weak attractive intermolecular forces |

Vector Quantity | A quantity, which needs both magnitude and direction to describe it. |

Velocity | Distance traveled by a body in a particular direction per unit time or the displacement of the body per unit time. It is a vector quantity. |

Vibration | A back and forth motion that repeats itself. |

Virtual image | An image formed when the reflected or refracted light rays appear to meet; this image cannot be projected on a screen. |

Volt | Unit of potential difference, equivalent to joule/coulomb. |

Voltage drop | The electric potential difference across a resistor or other part of a circuit that consumes power. |

Ultrasonic Sound | Sound waves of frequencies above 20,000Hz. |

Uniform Circular Motion | The motion of an object in a circular path with uniform speed. |

Unpolarized light | Light consisting of transverse waves vibrating in all possible random directions. |

Tesla | The S.I. unit of magnetic flux density, defined as the magnetic flux density of a magnetic flux of 1 Wb through an area of 1m2. |

Thermal Capacity | The quantity of heat required to raise the temperature of the whole body by 1 . |

Thermal Equilibrium | When the two bodies in contact are at the same temperature and there is no flow of heat between them, these are said to be in thermal equilibrium. |

Thermal Expansion | The increase in the size of an object on heating. |

Total internal reflection | Condition where all light is reflected back from a boundary between materials; occurs when light travels from denser to rarer medium and angle of incidence is greater than the critical angle. |

Transverse wave | A wave in which the particles of the medium oscillate in a direction perpendicular of the direction of propagation of wave. |

Trough | The point of maximum negative displacement on a transverse wave. |

Kelvin's statement of second law of thermodynamics | It is impossible that, at the end of a cycle of changes, heat has been extracted from a reservoir and an equal amount of work has been produced without producing some other effect. |

Kinetic energy | The energy possessed by a body due to its motion, it is equal to ½ mv2, where m is the mass and v is the speed of the body |

Kepler's first law of planetary motion | Each planet moves in an elliptical orbit, with the sun located at one of the foci. |

Kepler's second law of planetary motion | The radius vector joining the planet to the sun covers equal areas in equal intervals of time. |

Kepler's third law of planetary motion | The square of the period of a planet is directly proportional to the cube of the radius of the semi major axis of the orbit. |

Kilocalorie | The amount of energy required to raise the temperature of one kilogram of water by 1 , 1 Kcal = 1000 calories. |

Ohm | Unit of resistance; 1 ohm = 1volt/ampere. |

Ohm's law | The current flowing through a conductor is directly proportional to the potential difference across the ends of the conductor. |

Open system | A system across whose boundaries both matter and energy can pass. |

Optical fiber | A long, thin thread of fused silica, used to transmit light, based on total internal reflection. |

Oscillatory motion | The to and fro motion of a body about its mean position. |

Latent heat of fusion | The quantity of heat required to convert one unit mass of a substance from solid to the liquid state at its melting point without any change in its temperature. |

Half-life | The time during which half the number of atoms in the element disintegrate. |

Heisenberg uncertainty principle | It is impossible to have a particle that has an arbitrarily well-defined position and momentum at the same time. |

Hertz | The unit of frequency, also known as cycles per second. |

Hooke's law | Within elastic limit, stress is directly proportional to strain. |

Horsepower | unit of power, 1H.P. = 746 Watts. |

Huygens'principle | Each point on a light wavefront can be regarded as a source of secondary waves, the envelope of these secondary waves determining the position of the wavefront at a later time. |

Gamma ray | A high energy photon |

Inertia | The property of a body to resist a change in its state of rest or of uniform motion. |

Black hole | The remaining core of a supernova that is so dense that even light cannot escape. |

Doppler Effect | The apparent change in the frequency of a wave due to relative motion between the source and the observer. |

Bibliography | etutorphysics.com/glossary |