RAYS AND WAVES

·   Gamma rays are considered the death rays.

·   Gamma rays travel with the velocity of light

·   Gamma rays have maximum penetrating power

·   Shortest wavelength among alpha, beta and gamma is of gamma rays

·   Laser rays are used in micro surgery

·   Alpha radiations produce burns on human body

·   Newton proved that sunlight consists of different colors

·   Beta rays are fast moving electrons.

·   Color with shortest wavelength is Blue

·   Violet have shortest wave length and Red has longest wavelength (vibgyor)

·   Red light’s wave length is 11800 waves/cm (infra red)

·   Least deviated color in prism is red

·   Greatest deviated color in prism is indigo (Check violet)

·   Violet light’s wave length is 23600 waves/cm (ultra violet)

·   Ultraviolet rays are less than 3000 deg: A

·   Greatest value of wavelength is of infra red

·   Visible waves are between 400-700 nanometers.

·   MOTE = Million Tons of oil equivalent

·   REM = Roentgen equivalent in man

·   Transverse waves can only be produced in solids

·   Longitudinal waves can be produced in solids, liquids and gases

·   On passing thought food stuff, x-ray can kill bacteria

·   Violet color of light t ravel thought glass with minimum speed

·   There is no wavelength of light for color brown.

·   White light is a mixture of all the colors in the rainbow.

·   Blue has the shortest wavelength and red the longest.

·   Radio waves also come from sun and outer space. Astronomers use radio telescope to hear them.

·   Radar uses microwaves.

·   Anything that is warm produces infrared waves including us. The hotter the thing the more IR.

·   Infrared waves are used in TV remote control.

·   X-rays have shorter wavelength and more energy than ultraviolet rays.

·   Gamma rays come from radioactive materials. They are used to kill cancers.

·   Without exposure to ultraviolet light our bodies would not be able to make vitamin D.

·   UHF, ultra high frequency are radio waves used for TV broadcast

·   Microwaves are used in radar, mobile phones, microwave oven, communication network

·   Each light color is of different wavelength.

·   Red light has the longest wavelength while violet light has the shortest.

·   Waves with a longer wavelength than red light are invisible they are called infrared waves.

·   Invisible Ultraviolet wave have wavelength shorter than violet light.

·   Red, Blue, Green are prime colors.

·   Red + Blue + Green = white

·   The wavelength of visible light is between 1350-2500

·   An object that reflects all the light looks white.

·   Loudspeaker converts electrical energy into sound energy.

·   Light coloured clothes are generally worn in summer

·   The electrical device which transform voltage: transformer

·   A nuclear reaction in which two or more than two lighter nuclear are fused together to form a relatively heavier one: nuclear fusion

·   The three colours combination which produces the sensation of white light: Red green and blue

·   The clear sky looks blue because of dispersion of light

·   When light waves travel from air to glass the wavelength and velocity variables are affected.

·   Electrical lines of forces are imaginary.

Frequency distinguishes ultrasound from normal audible sound. Its f > 20,000 Hz.