Description : When the ground gets warm it emits an invisible type of light called infrared light. This light can travel into the atmosphere and heat the air that it encounters.?
Last Answer : Some parts of the air - the so-called green-house gasses. Notthe more common parts of the air.
Description : Which of the following non-metal reacts and catches fire on exposure to air? a) phosphorous b)nitrogen c)sulphur d)hydrogen
Last Answer : a) phosphorous
Description : Sodium fluorescein: a. has a higher affinity for plasma protein than indocyanine green. b. does not leak from the choroidal vasculature. c. does not leak from normal retinal vasculature. d. emits light of longer wavelengths than the one it absorbs
Last Answer : does not leak from normal retinal vasculature.
Description : White phosphorous burns in atmosphere at?
Last Answer : 30°C
Description : Conversion of yellow phosphorus to red phosphorous is done in retorts at 250-450°C in the (A) Presence of an inert atmosphere (B) Presence of a reducing atmosphere (C) Absence of air (D) Presence of an oxidising atmosphere
Last Answer : (C) Absence of air
Description : Acid rain is caused due to pollution of atmosphere by (1) oxides of carbon and nitrogen (2) oxides of nitrogen and sulphur (3) oxides of nitrogen and phosphorous (4) None of these
Last Answer : oxides of nitrogen and sulphur
Description : Lung cancer & DNA breakage are the major ill effects of excessive ozone exposure to human beings. Ozone layer depletion in the atmosphere is mainly caused by the presence of (A) CO2 (B) SO2 (C) Hydrocarbons (D) CFC (chloro fluoro carbon)
Last Answer : (D) CFC (chloro fluoro carbon)
Description : Exposure to __________ accelerates the degradation of plastics. (A) Ultraviolet radiation (B) High atmospheric temperature (C) High ambient temperature (D) Damp atmosphere
Last Answer : A) Ultraviolet radiation
Description : The process by which a substance absorbs moisture upon exposure to the atmosphere is called: w) efflorescence x) deliquescence y) dehydrogenation z) desalination
Last Answer : ANSWER: X -- DELIQUESCENCE
Description : Pick out the wrong statement. (A) 'Green acid' is the other name of phosphoric acid produced by the reaction of phosphate rock & sulphuric acid (B) Chemically unreactive nature of ... in the manufacture of safety matches, is converted into white phosphorous by vaporisation followed by condensation
Last Answer : (C) Red phosphorous is the most reactive allotropic form of phosphorous
Description : A pulsar is a rapidly spinning neutron star which emits: A. A blinding light when it aligns with the planets B. Radio waves detectable from Earth (Answer) C. A gravitational pull which attracts high energy dust particles D. Enough energy to power itself indefinitely
Last Answer : B. Radio waves detectable from Earth (Answer)
Description : What electronic accessory item emits blue light at one end of it?
Last Answer : answer:Could you post a photo? Are there any markings on it? Many Bluetooth accessories, such as wireless earpieces for cell phones, have a blue LED.
Description : When chlorophyll absorbs light, what does it gets excited and emits? -Do You Know?
Last Answer : answer:
Description : What is a neutron star which a Emits radiation that reaches the earth as radio waves and flashes of visible light?
Last Answer : pulsar
Description : Sun appears red in colour at sun-rise and sunset due to – (1) the fact that sun emits only red colour at that time (2) red light having longer wave length scatters away (3) that sun Comes out of the mountains (4) that all other colours scatter away except red
Last Answer : (4) that all other colours scatter away except red Explanation: According to Rayleigh's law, the intensity of scattered light varies inversely as the fourth power of its wavelength. Sunlight consists of ... have to travel a larger part of the atmosphere because they are very close to the horizon.
Description : Every hot object emits – (1) X-rays (2) Visible light (3) Infrared rays (4) Ultraviolet rays
Last Answer : (3) Infrared rays
Description : Which laser emits light in the visible range 400 to 700 nm? a. Argon-ion b. Nitrogen c. Carbon-dioxide d. Neodymium-YAG
Last Answer : a. Argon-ion
Description : A pn-junction diode emits light by spontaneous emission ∙ A. LED ∙ B. APD ∙ C. PIN
Last Answer : A. LED
Description : Which laser emits light in the visible range 400 to 700 nm? ∙ a. Argon-ion ∙ b. Nitrogen ∙ c. Carbon-dioxide ∙ d. Neodymium-YAG
Description : A light emitting diode emits light only when (a) Reversed biased (b) forward biased (c) unbiased (d) none
Last Answer : (b) forward biased
Description : Every hot object emits _____ (1) X–rays (2) Visible light (3) Infrared rays (4) Ultraviolet rays
Last Answer : Infrared rays
Description : Sun appears red in colour at sunrise and sunset due to (1) the fact that sun emits only red colour at that time (2) red light having longer wave length scatters away (3) that sun comes out of the mountains (4) that all other colours scatter away except red
Last Answer : that all other colours scatter away except red
Description : LED emits light : - a) only in RED color b) only in YELLOW color c) only in GREEN color d) In RED, GREEN, YELLOW and AMBER color
Last Answer : LED emits light : - In RED, GREEN, YELLOW and AMBER color
Description : A metal X' acquires a green colour coating on its surface on exposure to air. (i) Identify the metal X' and name the process responsible for this change. (ii)Name and write chemical ... the green coating formed on the metal. (iii) List two important methods to prevent the process. -Chemistry
Last Answer : (i) Metal is copper. The process is corrosion. (ii)Basic copper carbonate [CuCO3.Cu(0H)2]. (iii) • It should be coated with tin • It should be mixed with other metals to form alloys.
Description : Bearings subjected to light load are made of (A) White metal (B) Phosphorous bronze (C) Monel (D) Silicon bronze
Last Answer : (B) Phosphorous bronze
Description : Red phosphorous is changed into white phosphorous by (A) Heating in presence of light (B) Melting under pressure (C) Vaporisation followed by condensation (D) None of these
Last Answer : (C) Vaporisation followed by condensation
Description : A stationary helium ion emits a photon corresponding to the first line of Lyman series. That photon liberates a photoelectron form a stationary hydrog
Last Answer : A stationary helium ion emits a photon corresponding to the first line of Lyman series. That ... and ionisation energy of hydrogen atom=13.6ev.
Description : A substance emits energy which is detected as a line emission in the visible region using a spectroscope. The origin of this energy is (a) Vibrational energy of the molecules (b) Rotational energy of the molecules (c) Energy of orbital electrons (d) Energy of protons in the nucleus.
Last Answer : Ans:(c)
Description : In light of one of our jellies recent "southern exposure" what are some expressions that are indigenous to your area?
Last Answer : Slicker n snot on a hoe handle.
Description : On exposure to light rhodopsin forms (A) All trans-retinal (B) Cis-retinal (C) Retinol (D) Retinoic acid
Last Answer : Answer : A
Description : Ethers are stored in brown bottles. This is because on exposure to air and light ethers are converted to (a) Peroxides (b) Oxonium ions (c) Ozonides (d) Electrophiles
Last Answer : Peroxides
Description : What needs to come into consideration when using UV light to sterilize? a. It Needs Direct Exposure b. It Can Cause Skin Cancer c. It May Not Be Effective Against All Kinds Of Endospores d. A-C Are Correct
Last Answer : d. A-C Are Correct
Description : The nurse advises the patient undergoing photodynamic therapy (PDT) for macular degeneration to avoid exposure to direct sunlight or bright lights for a) the first five days after the procedure. ... should avoid exposure to direct sunlight or bright lights for the first five days post-treatment.
Last Answer : a) the first five days after the procedure. Photodynamic therapy includes the use of verteporfin, a light-activated dye. The dye within the blood vessels near the surface of the skin could ... days post-treatment. Inadvertent sunlight exposure can lead to severe blistering of the skin and sunburn.
Description : How does a microwave oven heat up food even though it emits no thermal radiation? -Physics
Last Answer : A microwave oven does emit thermal radiation to heat up food. Microwave radiation is thermal radiation. For some reason, most sources have a mistaken notion that thermal radiation = infrared radiation ... a broad spectrum of frequencies with a certain shape that depends on the emitter's temperature.
Description : A frheshly prepared radioactive source of half life 2 hrs emits radiation of intensity which is 32 times the permissible safe value of intensity. Whic
Last Answer : A frheshly prepared radioactive source of half life 2 hrs emits radiation of intensity which is 32 times the ... B. 5hrs C. 10 hrs D. 32 hrs
Description : A dye absorbs a photon of wavelength `lambda` and re`-` emits the same energy into two phorons of wavelengths `lambda_(1)` and `lambda_(2)` respective
Last Answer : A dye absorbs a photon of wavelength `lambda` and re`-` emits the same energy into two phorons of wavelengths ` ... 2))/((lambda_(1)+lambda_(2))^(2))`
Description : A radioactive atom `X` emits a `beta-`particle to produce an atom `Y` which then emits an Particle to give an atom `Z` (1) the atomic number of `X` is
Last Answer : A radioactive atom `X` emits a `beta-`particle to produce an atom `Y` which then emits an Particle to give ... C. 2 and 3 are correct D. 3 is correct
Description : `._(92)U^(238)` emits `8 alpha-` particles and `6 beta-` particles. The `n//p` ratio in the product nucleus is a)`(62)/(41)` b)`(60)/(41)` c)`(61)/(42
Last Answer : `._(92)U^(238)` emits `8 alpha-` particles and `6 beta-` particles. The `n//p` ratio in the product nucleus ... A. 60/41 B. 61/40 C. 62/41 D. 61/42
Description : A radioactive element is preset in VIII group of the periodic table. If it emits one `alpha`particle, the new position of the nuclide will be
Last Answer : A radioactive element is preset in VIII group of the periodic table. If it emits one `alpha`particle, the new ... . VI B B. VIII C. VIIB D. I B
Description : A freshely prepared radioactive source of half 2 hours emits radiations of intensity which is 64 times the permissible safe level. The minimum time af
Last Answer : A freshely prepared radioactive source of half 2 hours emits radiations of intensity which is 64 times the ... 12 hours C. 24 hours D. 48 hours
Description : When `._(88)^(226)Ra` emits an `alpha`-particle, the new element formed belongs to:
Last Answer : When `._(88)^(226)Ra` emits an `alpha`-particle, the new element formed belongs to: A. third group B. zero group C. fourth group D. second group
Description : If by mistake radioactive substance gets into human body, then from the point of view of radiation damage, the most harmful will be one that emits.
Last Answer : If by mistake radioactive substance gets into human body, then from the point of view of radiation damage, ... neutrons C. `beta`-rays D. `alpha`-rays
Description : A stationary `._(82)^(200)Pb` nucleus emits an `alpha`-particle with kinetic energy `T_(alpha) = 5.77 MeV`. Find the recoil velocity of a daughter nuc
Last Answer : A stationary `._(82)^(200)Pb` nucleus emits an `alpha`-particle with kinetic energy `T_( ... accounted for by the recoil energy of daughter nucleus ?
Description : A stationary hydrogen atom emits a photon corresponding to the first line of the Lyman series. What is the velocity of recoil of the atom? `(m_(H)=1.6
Last Answer : A stationary hydrogen atom emits a photon corresponding to the first line of the Lyman series. What is the velocity ... `(m_(H)=1.672xx10^(-27) kg)`
Description : A luminous object O is located at the bottom of a big pool of liquid of refractive index `mu` and depth h. The object O emits rays upwards in all dire
Last Answer : A luminous object O is located at the bottom of a big pool of liquid of refractive index `mu` ... Determine the radius and the area of the circle .
Description : A hydrogen like gas emits radiation of wavelengths `460 Å, 828 Å` and `1035Å`, only. Assume thar the atoms have only two excited states and the differ
Last Answer : A hydrogen like gas emits radiation of wavelengths `460 Å, 828 Å` and `1035Å`, only. Assume ... of the ground state and the first excited state.
Description : An electron gun emits `2.0xx10^(16)` electrons per second. What is the associated current ?
Last Answer : An electron gun emits `2.0xx10^(16)` electrons per second. What is the associated current ?
Description : Find the quantum number `n` corresponding to the excited state of `He^(+)` ion, if on transition to the ground state that ion emits two photons in suc
Last Answer : Find the quantum number `n` corresponding to the excited state of `He^(+)` ion, if on transition to the ... with wave lengths `108.5` and `30.4 nm`.
Description : What object in the universe emits microwaves?
Last Answer : Need answer