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Work Energy Power > Spectrum > Flashcards

Spectrum Flashcards

1
Q

In visible light _________ deviated the most

A

violet colour

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2
Q

which colour is deviated the least ______

A

red

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3
Q

wavelength of violet _______

A

4000 A

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4
Q

wavelength of red light ________

A

8000 A

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5
Q

in glass speed of ________ is more

A

red

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6
Q

in glass speed of __________ is least

A

violet

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7
Q

prominent colour’s in white light -

A

VIBGYOR

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8
Q

1 nm = ____m = ____A

A

1nm = 10^-9 m = 10 A

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9
Q

1 A= ____ cm

A

10^-8

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10
Q

which has longest wavelength in white light also lowest frequency

A

red

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11
Q

which as shortest wavelength in white light or highest frequency

A

violet

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12
Q

from violet end to red end _________ increases and ________ decreases

A

wavelength , frequency

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13
Q

white light is _________ in nature

A

polychromatic

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14
Q

dispersion

A

phenomenon of splitting of white light by a prism into constituent colour is known as dispersion

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15
Q

Spectrum means

A

on passing white light into prism , the band of colour seen in screen is called spectrum

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16
Q

deviation of light occurs at ______ surface of prism

A

both

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17
Q

dispersion occurs only at _____surface

A

one

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18
Q

what is invisible spectrum ?

A

the part of spectrum beyond the red and violet extreme

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19
Q

the waves of wavelength longer than red light of visible spectrum

A

infrared radiation , microwaves ,radio waves

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20
Q

waves of wavelength shorter than violet part of visible spectrum in decreasing order

A

ultra violet rays ,x rays ,gamma rays

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21
Q

speed , frequency , wavelength is related as [formula]

A

c=f/lambda , lambda -wavelength

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22
Q

gamma rays : wavelength nm-

A

below 0.01nm or 0.1 A

23
Q

gamma rays discovered by

A

becquerel and curie

24
Q

source of gamma rays

A

in cosmic rays from radio active substance

25
Q

uses of gamma rays -

A

they used to kill cancer cells and in industry to check welding

26
Q

properties of gamma rays -

A

cause fluorescence when they strike fluorescent materials [ zinc sulphide ] , penetrate through metallic sheet

27
Q

wavelength of x rays -

A

0.01 to 10 nm , 0.1 to 100 A

28
Q

properties of x rays

A

they affect photographic plate ,cause fluorescence when they strike fluorescent materials [ zinc sulphide ] , peneterate through human flesh but stopped by bone

29
Q

x rays discovered by -

A

roentgen

30
Q

source of x rays

A

from high melting target of heavy metal when highly energetic electrons are stopped by it

31
Q

wavelength of ultra violet rays also who found that

A

10 to 400 nm , 100 A to 4000 A , ritter [1801]

32
Q

ultraviolet rays source -

A

sun light , arc-lamp , spark

33
Q

on striking to ultra violet radiations silver chloride turns ________.

A

dark brown

34
Q

other name of ultraviolet radiations

A

actinic rays

35
Q

________ absorbs ultraviolet radiations

A

glass prism so its obtained on quartz prism

36
Q

why is ultraviolet bulbs have envelope made of quartz instead of glass

A

glass absorbs ultraviolet radiations

37
Q

_______ travels straight line in air [ speed of 3* 10^8

A

ultraviolet radiations

38
Q

properties of ultraviolet radiations

A

they scattered in atmosphere
they affect photographic plate ,cause fluorescence when they strike fluorescent materials [ zinc sulphide ]
they obey laws of reflection and refraction

39
Q

use of ultraviolet radiation

A

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

40
Q

infrared rays - wavelength , discovered , source

A

800 to 10^6 nm

8000 to 10^7 A, william hershell in 1800

41
Q

_______ used to detect heat radiation

A

thermopile

42
Q

_______ connected with thermopile shows deflection when infrared rays falls on thermopile

A

galvanometer

43
Q

which prism used for obtaining infrared radiation

A

rock-salt prism , glass absorbs it

44
Q

source of infrared

A

all red hot bodies

45
Q

properties of infrared rays

A

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

46
Q

uses and harmful effect of infrared radiation

A

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

47
Q

micro waves - wavelength

A

10^6 to 10^10 nm - 10^7 to 10^11 A

48
Q

micro waves discovered by

A

hertz

49
Q

micro waves uses and source

A

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

50
Q

which wave has longest wavelength among all wave ?

A

Radio wave

51
Q

wavelength of Radio wave -

A

above 10^10 nm - 10^11 A

52
Q

radio waves found by

A

marconi

53
Q

radio wave uses and source

A

source in tv and radio transmission

mainly used in radar communication

54
Q

visible light affect photographic plate true/false ?

A

true

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