LET’S START THE – PHYSICAL QUANTITIES AND THEIR UNITS

INTRODUCTION

Length -meter

Time – second

Velocity -metre/second

Angular velocity -rad/sec

Acceleration -metre/sec^{2}

Force -Newton

Pressure -Pascal

Temperature -Kelvin

Mass-kilogram

Density -kg/m^{3}

Heat-Joule

Energy -Joule

Electric current -ampere

Area-square metre

Specific heat capacity -J0ule/kg.k

Electric power -kilowatt-hour (kwh)

Electric resistance -Ohm

Electric potential- volt

Latent heat -Joule/k

Surface tension -Newton/metre

Moment of inertia -Kgm^{2}

Electric capacity -faraday

Power -Joule /second or watt

Viscosity -Newton -sec .metre^{-2}

Work-Newton-metre 0r joule

Luminous intensity -Luman

Luminous intensity -Candela

Frequency -Hertz

Wavelength-metre

Speed -metre/sec

Plane angle -radian

Intensity (in sound )-decibel

Absolute temperature -kelvin

Potential difference -volt

Electric field / intensity -Newton/coulomb

Magnetic field /induction -Tesla , Weber/metre^{2}

Magnetic dipole/movement -Ampere-metre

Magnetic flux-Weber, or Maxwell

Linear momentum – Newton sec

Power of the Lens – Diopter

Solid angle -Steradian

Atmosphere pressure – bar

Astronomical distance -light year

Supersonic motion -Mach

Acceleration due to gravity -metre/sec^{2}

Amount of substance – mole

Young modulus elasticity -Newton /metre^{2}

Entropy – Joule/kelvin

Parsec is the unit of distance

Shortest unit of length is Nanometer

Light-year is the unit of distance

Absorbed dose – gray

Absorbed dose – rad

1 Gray- 1 joule/kg

1 Gray-100 rad

Exposure-c/kg

Activity -Becquerel (Bq) of

1 Curie- 3.7×10^{10}Bq

1Bq- 2.7×10^{-11}ci

1 Roentgen- 2.5×10^{-4} coulomb/kg

Other facts –The visible range of solar radiation is -400-700 Nm

The nature of light radiation is wave and particle both (dual )

Electromagnetic radiation -X-ray & Gama ray

The ratio of the velocity of X-ray and Gama-ray is -1

The frequency of sound waves in the audible (hearing) range is 20 Hz to 20,000 Hz (20 kHz)

The ultrasonic waves used in diagnostic imaging frequency range is 1 MHz – 20 MHz

Ultrasonic waves frequency – more than 20,000 Hz

Infrasonic waves frequency -less than 20 Hz

Navigators used frequency -SONAR

Maximum speed of sound occur in steel

The power of sunglasses is (zero) 0 Diopter

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