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Class 9Class 10First YearSecond Year
19.16Whycanredlightbeusedinaphotographicdarkroomwhendevelopingfilmsbutablueorwhitelightcannot? 19.16 Why can red light be used in a photographic dark room when developing films but a blue or white light cannot?

19.9 What is the de Broglie wavelength of an electron whose kinetic energy is 120 \mathrm{eV} ?[Ans. 1.12 \times 10^{-10} \mathrm{~m} ]
 19.9  What is the de Broglie wavelength of an electron whose kinetic energy is  120 \mathrm{eV}  ?[Ans.  1.12 \times 10^{-10} \mathrm{~m}  ]

19.9WhatisthedeBrogliewavelengthofanelectronwhosekineticenergyis120eV?[Ans.1.12×1010 m] 19.9 What is the de Broglie wavelength of an electron whose kinetic energy is 120 \mathrm{eV} ?[Ans. 1.12 \times 10^{-10} \mathrm{~m} ]

19.1 What are the measurements on which two observers in relative motion will always agree upon?
19.1 What are the measurements on which two observers in relative motion will always agree upon?

19.1Whatarethemeasurementsonwhichtwoobserversinrelativemotionwillalwaysagreeupon?19.1 What are the measurements on which two observers in relative motion will always agree upon?

19.12 When ultraviolet light falls on certain dyes visible light is emitted. Why does this not happen when infrared light falls on these dyes?
19.12 When ultraviolet light falls on certain dyes visible light is emitted. Why does this not happen when infrared light falls on these dyes?

19.12Whenultravioletlightfallsoncertaindyesvisiblelightisemitted.Whydoesthisnothappenwheninfraredlightfallsonthesedyes?19.12 When ultraviolet light falls on certain dyes visible light is emitted. Why does this not happen when infrared light falls on these dyes?

19.16 Why can red light be used in a photographic dark room when developing films but a blue or white light cannot?
 19.16  Why can red light be used in a photographic dark room when developing films but a blue or white light cannot?
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19.16Whycanredlightbeusedinaphotographicdarkroomwhendevelopingfilmsbutablueorwhitelightcannot? 19.16 Why can red light be used in a photographic dark room when developing films but a blue or white light cannot?

19.10 Which has the lower energy quanta? Radiowaves or X-rays
19.10 Which has the lower energy quanta? Radiowaves or X-rays

19.10Whichhasthelowerenergyquanta?RadiowavesorXrays19.10 Which has the lower energy quanta? Radiowaves or X-rays

19.7^{\prime} What is the maximum wavelength of the two photons produced when a positron annihilates an electron? The rest mass energy of each is 0.51 \mathrm{MeV} .[Ans. 2.44 \times 10^{-12} \mathrm{~m} ]
 19.7^{\prime}  What is the maximum wavelength of the two photons produced when a positron annihilates an electron? The rest mass energy of each is  0.51 \mathrm{MeV} .[Ans.  2.44 \times 10^{-12} \mathrm{~m}  ]

19.7Whatisthemaximumwavelengthofthetwophotonsproducedwhenapositronannihilatesanelectron?Therestmassenergyofeachis0.51MeV.[Ans.2.44×1012 m] 19.7^{\prime} What is the maximum wavelength of the two photons produced when a positron annihilates an electron? The rest mass energy of each is 0.51 \mathrm{MeV} .[Ans. 2.44 \times 10^{-12} \mathrm{~m} ]

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