Spectrum Flashcards
In visible light _________ deviated the most
violet colour
which colour is deviated the least ______
red
wavelength of violet _______
4000 A
wavelength of red light ________
8000 A
in glass speed of ________ is more
red
in glass speed of __________ is least
violet
prominent colour’s in white light -
VIBGYOR
1 nm = ____m = ____A
1nm = 10^-9 m = 10 A
1 A= ____ cm
10^-8
which has longest wavelength in white light also lowest frequency
red
which as shortest wavelength in white light or highest frequency
violet
from violet end to red end _________ increases and ________ decreases
wavelength , frequency
white light is _________ in nature
polychromatic
dispersion
phenomenon of splitting of white light by a prism into constituent colour is known as dispersion
Spectrum means
on passing white light into prism , the band of colour seen in screen is called spectrum
deviation of light occurs at ______ surface of prism
both
dispersion occurs only at _____surface
one
what is invisible spectrum ?
the part of spectrum beyond the red and violet extreme
the waves of wavelength longer than red light of visible spectrum
infrared radiation , microwaves ,radio waves
waves of wavelength shorter than violet part of visible spectrum in decreasing order
ultra violet rays ,x rays ,gamma rays
speed , frequency , wavelength is related as [formula]
c=f/lambda , lambda -wavelength
gamma rays : wavelength nm-
below 0.01nm or 0.1 A
gamma rays discovered by
becquerel and curie
source of gamma rays
in cosmic rays from radio active substance
uses of gamma rays -
they used to kill cancer cells and in industry to check welding
properties of gamma rays -
cause fluorescence when they strike fluorescent materials [ zinc sulphide ] , penetrate through metallic sheet
wavelength of x rays -
0.01 to 10 nm , 0.1 to 100 A
properties of x rays
they affect photographic plate ,cause fluorescence when they strike fluorescent materials [ zinc sulphide ] , peneterate through human flesh but stopped by bone
x rays discovered by -
roentgen
source of x rays
from high melting target of heavy metal when highly energetic electrons are stopped by it
wavelength of ultra violet rays also who found that
10 to 400 nm , 100 A to 4000 A , ritter [1801]
ultraviolet rays source -
sun light , arc-lamp , spark
on striking to ultra violet radiations silver chloride turns ________.
dark brown
other name of ultraviolet radiations
actinic rays
________ absorbs ultraviolet radiations
glass prism so its obtained on quartz prism
why is ultraviolet bulbs have envelope made of quartz instead of glass
glass absorbs ultraviolet radiations
_______ travels straight line in air [ speed of 3* 10^8
ultraviolet radiations
properties of ultraviolet radiations
they scattered in atmosphere
they affect photographic plate ,cause fluorescence when they strike fluorescent materials [ zinc sulphide ]
they obey laws of reflection and refraction
use of ultraviolet radiation
used for sterilising surgical equipment
for detecting purity of eggs , ghee, germs
for producing vitamin D
harmful to human body as it creates skin cancer
infrared rays - wavelength , discovered , source
800 to 10^6 nm
8000 to 10^7 A, william hershell in 1800
_______ used to detect heat radiation
thermopile
_______ connected with thermopile shows deflection when infrared rays falls on thermopile
galvanometer
which prism used for obtaining infrared radiation
rock-salt prism , glass absorbs it
source of infrared
all red hot bodies
properties of infrared rays
they travel in straight line at 3*10^8 in air or vacuum
they don’t affect ordinary photographic plate
rock-salt prism , glass absorbs it
not scattered much in earth atmosphere
detected by blackened bulb or thermopile
the green house gas absorbs low energy infrared radiation and keeps earth surface warm
uses and harmful effect of infrared radiation
it used to take photo’s at mist and fogy places
it is used as lamp in dark room for developing photo’s as it will not affect photographic plate
it is used for sending signals during war
used for therapeutic purpose
they’re used in remotes of tv and toys
high dose may cause skin burn
micro waves - wavelength
10^6 to 10^10 nm - 10^7 to 10^11 A
micro waves discovered by
hertz
micro waves uses and source
these waves are produced by crystal oscillators [electronic device ]
used for satellite communication
for cooking [ micro ovens ]
radar communication
analysis of atomic and molecular structure
which wave has longest wavelength among all wave ?
Radio wave
wavelength of Radio wave -
above 10^10 nm - 10^11 A
radio waves found by
marconi
radio wave uses and source
source in tv and radio transmission
mainly used in radar communication
visible light affect photographic plate true/false ?
true
