Physics 3

പ്രകാശം, അതിൻറെ ഘടകവർണ്ണങ്ങൾ, നിയമങ്ങൾ, ഫോട്ടോ ഇലക്ട്രിക് എഫക്ട് തുടങ്ങിയ ഭാഗങ്ങളാണ് ഇന്നത്തെ പാഠത്തിൽ ഉൾപ്പെടുത്തിയിരിക്കുന്നത്  

• Study of light

               Optics

• Speed of light

               3 x 108

• Time taken by Sun light to reach Earth

               8 Minute 20 Seconds (500 Sec)

• Time taken by Moon light to reach Earth

               1.3 Seconds

• Light travels fastest in

               Vacuum

• Light is an example of which wave type

               Transverse wave

• Speed of light was first measured by

               Ole Christian Romer

• Speed of light is least in which medium

               Diamond

• Density of light is maximum in which medium

               Diamond

• Density of light is minimum in which medium

               Vacuum

• Particles which travels faster than light

               Tachyons

• Tachyons were discovered by

               ECG Sudarshan

• Scientist who proved that light is an electro magnetic wave

               Henrich Hertz

• Unit of wavelength of light

               Angstrom

• Order of speed of light in different medium is

               Diamond<Glass<Water<Air<Vacuum

• Rainbow is always formed in 

               Opposite direction of Sun

• The Direction in which the rainbow is formed in morning

               West

• Color of sky in moon

               Black

• Reason for black Color of sky in moon

               Absence of atmosphere

• When a Red flower is observed through blue glass plate it appears as 

               Black

• Color of Green leaf in red light

               Black

• Color which is highly sensitive to human eye

               Yellow

• Color which is used in danger signals

               Red

• Color which is used Scientific labs for indicating danger

               Yellow

• Color used in fog lamp of vehicles

               Yellow

• Corpuscular theory of Light was proposed by

               Issac Newton

• Wave theory of Light was proposed by

               Christian Huygens

• Scientist who discovered that Sun Light consists of 7 colors

               Issac Newton

• Scientist who discovered that the light fastest in vacuum

               Leon Foucault

• Principle of three primary colors was proposed by

               Thomas Young

• Scientist who discovered that constituent colors join together to form composite light

               Issac Newton

• Electromagnetic wave theory was formulated by

               James Clerk Maxwell

• Scientist who proved that light is an electromagnetic wave

               Henrich Hertz

• Phenomenon of emission of electrons from a metal surface such as Sodium or Potassium when light ray falls on it is known as 

               Photoelectric effect

• Photoelectric effect was proposed by

               Henrich Hertz

• Photoelectric effect was explained by

               Albert Einstein

• The law of Photoelectric effect was formulated by

               Albert Einstein

• Photoelectric effect was explained by Einstein on the basis of

               Quantum theory

• Photoelectric effect cannot be explained on the basis of

               Electromagnetic theory

• In 1921 Albert Einstein got Nobel prize for

               Photoelectric effect

• Number of colors in visible light

               7 (VIBFYOR-Violet, Indigo, Blue, Green, Yellow, Orange and Red)

• Primary colors are 

               Red, Blue and Green

• Secondary colors are

               Yellow, Magenta and Cyan

• Primary colors used in television are 

               Red, Blue and Green

• Primary color pigments used in printing are 

               Yellow, Magenta, Cyan

• Colors obtained by mixing any two Primary colors are 

               Secondary Colors

• Green+Red=Yellow

• Blue+Red= Magenta

• Blue+Green= Cyan

• Any two colors which combined together to form white color is called  

               Complementary Colors

• Green+Magenta=White

• Blue+Yellow= White

• Red+Cyan= White

• Combining three primary colors we get

               White

• Distance between Sun and Earth is expressing in  

               Astronomical Unit

• Wavelength of visible light 

               400-700 nano meter
                                                                                                         (To be Continued...)