Categories
Assistant General Science

Physics – 04

പ്രകാശത്തിൻറെ പ്രത്യേകതകളായ റിഫ്‌ളക്‌ഷൻ, റിഫ്രാക്‌ഷൻ, ടോട്ടൽ ഇൻറെർണൽ റിഫ്‌ളക്‌ഷൻ, ഡിസ്പേഴ്‌സൺ, ഇന്റർഫെറൻസ്, ഡിഫ്രാക്ഷൻ, സ്‌കാറ്ററിങ്, പോളറൈസേഷൻ, ഡോപ്ലർ എഫക്ട് എന്നീ സുപ്രധാന ഭാഗങ്ങളാണ് ഇന്നത്തെ പാഠത്തിൽ ഉൾക്കൊള്ളിച്ചിരിക്കുന്നത്.

  • Color having minimum wavelength

Violet

 

  • Color having maximum wavelength

Red

 

  • Color having minimum frequency

Red

 

  • Color having maximum frequency

Violet

 

  • Light that scatters most

Violet

 

  • Light that scatters least

Red

 

  • Color which reflects all other colors

White

 

  • Color which absorbs all other colors

Black

 

  • Color which absorbs maximum heat

Black

 

  • Color which absorbs minimum heat

White

 

  • Color which appears on the upper portion of the rainbow

Red

 

  • Color which appears in the centre of the rainbow

Green

 

  • Color which appears on the lower portion of the rainbow

Violet

 

  • Distance travelled by light in one year

Lightyear

 

  • Unit used to measure distance between stars

Light year

 

  • One light year is

9.46×1012

 

  • One Parsec is

3.26 light years

 

  • Quantum theory was put forward by

Max Plank

 

  • According to Quantum theory, energy packets in light rays called

Quantum

 

  • Quantum of light is known as

Photon

 

  • Phenomenon of emission of light from substances after absorption of Photons called as

Photo Luminescence

 

  • Phenomenon of bouncing back of light when a beam of light falls on a surface

Reflection

 

  • Bending of light when a ray of light travels from one medium to another

Refraction

 

  • Phenomena of Mirage in deserts, Twinkling of stars, bending scale immersed in water\glass etc are due to

Refraction

 

  • Reason for refraction of light when travels from one medium to another

Phase velocity of wave is changed but its frequency remains constant

 

  • Snell’s law is related to

Refraction

 

  • Fata Morgana is a term associated with

Mirage (Superior form of Mirage)

 

  • Measure of optical density of a medium is

Refractive index [Speed of light in vacuum/Speed of light in medium]

 

  • Refractive index of Vacuum

1 [Ice : 1.31, Water : 1.33]

 

  • Refractive index of Diamond

2.42

 

  • Working principle of Optical fibre, endoscopy, Vehicle reflectors, Binoculars

Total Internal Reflection

 

  • Sparkling of Diamond is due to

Total internal reflection in high refractive index

 

  • Splitting of composite beam of light into its constituent colors is called

Dispersion of light

 

  • Dispersion of light is discovered by

Issac Newton

 

  • Device used to split composite light into constituent colors

Prism

 

  • Rainbow is caused by

Total internal reflection, refraction and dispersion of light by water particles

 

  • Red color in rainbow is seen at an angle of

42.8 Degree

 

  • Violet color in rainbow is seen at an angle of

40.8 Degree

 

  • Shape of rainbow while seeing from space

Circle

 

  • Distribution of light when two or more high waves superimpose each other is called

Interference

 

  • Colors in soap bubbles, oil layers etc are due to

Interference

 

  • Interference was first observed by

Thomas Young

 

  • Working principle of Holography\Hologram

Interference

 

  • Process of spreading out of light into geometrical shadow of obstacle is called as

Diffraction

 

  • Projector in film theatres works on the principle of

Diffraction

 

  • Rings around the sun, Fringe pattern of CD etc are due to

Diffraction

 

  • Blue color of Sky, Reddening of Sun at sunrise and sunset are due to

Scattering of light

 

  • The light color which scatters most

Violet (Having shorter wavelength)

 

  • The light color which scatters least

Red (Having longer wavelength)

 

  • Black color of sky in Moon is due to

Absence of scattering of light as there is no atmosphere

 

  • Phenomenon of confining the vibration of a transverse wave to a particular direction is called

Polarization

 

  • Brewster’s Law is associated with

Polarization of Light

 

  • Example of natural polarizing material

Tourmaline

 

  • Polaroids are using in

Aeroplane and car windows, sunglasses, Three-dimensional pictures

 

  • Light scattering by the particles in a colloid is known as

Tyndal effect

 

  • Example of Tyndal effect

Sunlight passing through mist, blue color seen in smoke emitted from motorcycles

 

  • Change in frequency of a light or sound wave when source or observer moves with respect to the other is known as

Doppler effect

 

  • Increase in frequency (decrease in wavelength) of visible light when it moves towards observer is called

Blue Shift

 

  • Decrease in frequency (Increase in wavelength) of visible light when it moves towards observer is called

Red Shift

 

  • Blueshift, Red Shift, High pitch of siren approaching ambulance is due to

Doppler effect


(To be Continued…)