Description : A black body when hot, emits heat radiation of __________ wavelengths. (A) Small (B) Large (C) All (D) One fixed
Last Answer : (C) All
Description : A beam of ultraviolet light of all wavelengths passes through hydrogen gas at room temperature, in the x. dimction. Assume thatall photons emitted due
Last Answer : A beam of ultraviolet light of all wavelengths passes through hydrogen gas at room temperature, in the ... light D. B will contain some visible light
Description : The branch of physics that deals with the investigation of wavelengths of electro magnetic radiation emitted or absorbed by atoms is known as a) spectroscopy b) astroscopy c) radioscopy d) stereoscopy
Last Answer : a) spectroscopy
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 : 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 : A gas of identical hydrogen-like atoms has some atoms in the lowest in lower (ground) energy level `A` and some atoms in a partical upper (excited) en
Last Answer : A gas of identical hydrogen-like atoms has some atoms in the lowest in lower (ground) energy ... and the minimum energies of the emitted photons.
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 : When chlorophyll absorbs light, what does it gets excited and emits? -Do You Know?
Last Answer : answer:
Description : Hydrogen atom electron is excited to n = 4 state , in the spectrum of emitted radiation , number of lines in the ultravoilet and visible regions are r
Last Answer : Hydrogen atom electron is excited to n = 4 state , in the spectrum of emitted radiation , number of lines in the ... 1 , 3 C. 2 , 3 D. 3 , 2
Description : The `6563 Å H_(2)` line emitted by hydrogen in a star is found to be red shifted by `15 Å`. Estimate the speed with which the star is receding from ea
Last Answer : The `6563 Å H_(2)` line emitted by hydrogen in a star is found to be red shifted by `15 ... the speed with which the star is receding from earth.
Description : In hydrogen atom, an electron is revolving in the orbit of radius `0.53 Å` with `6.6xx10^(15) rotations//second`. Magnetic field produced at the centr
Last Answer : In hydrogen atom, an electron is revolving in the orbit of radius `0.53 Å` with `6.6xx10^(15) rotations//second`. ... 5 Wb//m^(2)` D. `125 Wb/m^(2)`
Description : When a solid material is heated, it always: w) emits a discrete radiation spectrum x) glows red y) emits a continuous radiation spectrum z) emits only visible radiation
Last Answer : ANSWER: Y -- EMITS A CONTINUOUS RADIATION SPECTRUM
Description : Which of the following has more number of `p pi-dpi` bonds?(all central atoms are in excited states)
Last Answer : Which of the following has more number of `p pi-dpi` bonds?(all central atoms are in excited states) A. `SO_(2)` B ... `SO_(3)^(2-)` D. `CO_(3)^(2-)`
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 : 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 : When a warm object is heated up why does the thermal radiation emits change?
Last Answer : Feel Free to Answer
Description : When a warm object is heated up why does the thermal radiation it emits changes?
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 : Maximum amount of thermal radiation is emitted at all wavelengths at any specified temperature by a/an __________ body. (A) Grey (B) Black (C) Opaque
Last Answer : (A) Grey
Description : Which one of the following statements is correct? (A) During the day, earth reflects solar radiation (B) During the day, earth reflects both solar radiations the emission from its surface (C) During the night, earth emits radiation from its surface (D) All of these
Last Answer : Answer: Option D
Description : Thermal radiation is an electromagnetic radiation with wavelengths in _____ range. A. 1 to 100 µm B. 0.1 to 100 µm C. 0.1 to 10 µm D. 10 to 100 µm
Last Answer : 0.1 to 100 µm
Description : In organic molecules, fluorescence seldom results from absorption of UV radiation of wavelengths lower than (A) 350 nm (B) 200 nm (C) 300 nm (D) 250 nm
Last Answer : (A) 350 nm
Description : In order to obtain spectrum from the emitted radiation, the atomic gas or vapour must be excited at a) much less than atmospheric pressure b) much high than atmospheric pressure c) atmospheric pressure d) high pressure and temperature
Last Answer : a) much less than atmospheric pressure
Description : Monochromatic radiation of wavelength `lambda` is incident on a hydrogen sample in ground state. hydrogen atoms absorb a fraction of light and subsequ
Last Answer : Monochromatic radiation of wavelength `lambda` is incident on a hydrogen sample in ground state. ... different wavelength .Find the value of `lambda`
Description : A gas of hydrogen like ions is prepared in a particular excited state A if emit photons havingwavelength equal to the wavelength of the first line of
Last Answer : A gas of hydrogen like ions is prepared in a particular excited state A if emit photons ... find the principal quantum number of the stateA`
Description : 3.0 lbm of air are contained at 25 psia and 100 ˚F. Given that Rair = 53.35 ft-lbf/lbm- ˚F, what is the volume of the container? A.10.7 ft^3 B.14.7 ft^3 C.15 ft^3 D.24.9 ft^3 Formula: use the ideal gas law pV = mRT T = (100 +460) ˚R V = mRT/p
Last Answer : 24.9 ft^3
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 : What is the volume of a right prism standing on a triangular base of sides 5 cm, 5 cm and 8 cm whose lateral surface area is 828 cm^2 ? -Maths 9th
Last Answer : Lateral surface area of a prism = Perimeter of base Height ⇒ 840 = (5 + 5 + 8) Height ⇒ Height = 8401884018 = 46 cm. = Semi perimeter of the triangular base = 182182 = 9 cm ∴ Area of triangle = 9(9- ... 4 1 = 12 cm2 ∴ Required volume of prism = Area of base Height = (12 46) cm3 = 552cm3
Description : What is bigger 0.828 or 0.882?
Last Answer : 0.882 is bigger than 0.828
Description : If the head over the triangular notch is doubled, the discharge will increase by __________ times. (A) 2 (B) 2.828 (C) 5.657 (D) 4
Last Answer : (C) 5.657
Description : The height of the tallest building in the world is: (a) 601 meter (b) 632 meter (c) 828 meter (d) None of these
Last Answer : (c) 828 meter
Description : If the rate of gain of radial acceleration is 0.3 m per sec3 and full centrifugal ratio is developed. On the curve the ratio of the length of the transition curve of same radius on road and railway, is (A) 2.828 (B) 3.828 (C) 1.828 (D) 0.828
Last Answer : (A) 2.828
Description : In an competitive examination, the average was found to be 72 marks. After detecting the errors the marks of 94 candidates had to be charged from 90 to 66 each, and the average is reduced to 64 marks. Find the total number of candidates who took the exam. A) 282 B) 382 C) 828 D) 200
Last Answer : A) let the number of candidates be A total marks of candidates = 72A after detecting error the change of marks for one candidate = 90 - 66 = 24 marks change of marks for 94 candidates = 94*24 = ... after detecting error of N candidates = 64A then, 72A- 2256= 64A , 8A=2256 A=282
Description : A parallel beam, of light of wavelength 100 nm passed through a sample of atomic hydrogen gas in ground state. (a) Assume that when a phton supplies s
Last Answer : A parallel beam, of light of wavelength 100 nm passed through a sample of atomic hydrogen gas ... of radiation that may be detected by the detector.
Description : Which one of the following best defines the word allotropes ? A Different structural forms of an element B A pair of substances that differ by H+ C Elements that possess properties intermediate between ... a specific number of neutrons E The different phases (solid, liquid or gas) of a substance
Last Answer : A Different structural forms of an element
Description : What hydrohen-like ion has the wave-length difference between the first lines of the Balmer and Lyman series equal to `593 Å`.
Last Answer : What hydrohen-like ion has the wave-length difference between the first lines of the Balmer and Lyman series equal to `593 Å`.
Description : What causes photons to be emitted from excited atoms?
Last Answer : The energy difference, between two energy levels, is emitted asa photon, when the electron "falls down" to a lower energylevel.
Description : An atomic energy state in which more atoms are in the lower energy state E1 than in the excited state E2, is known as a) population inversion b) normal population c) stimulated population d) atomic population
Last Answer : b) normal population
Description : The wavelength of first member ofBalmer Series is 6563 Å. Calculate the wavelength of second member of Lyman series.
Last Answer : The wavelength of first member ofBalmer Series is 6563 Å. Calculate the wavelength of second member of Lyman ... B. 2050Å C. 6563Å D. none of these
Description : The number of photons emitted in 10 hours by a 60 W sodium lamp `(lambda` of photon `= 6000 Å)`
Last Answer : The number of photons emitted in 10 hours by a 60 W sodium lamp `(lambda` of photon `= 6000 Å)` A. `6. ... C. `8.40xx10^(23)` D. `3.40xx10^(23)`
Description : The frequency of light for 1.0 `Å` wavelenght is :-
Last Answer : The frequency of light for 1.0 `Å` wavelenght is :- A. `3xx10^(18)Hz` B. `3xx10^(18)sec^(-1)` C. `3xx10^(18)` Cycles per sec D. All of the above.
Description : The size of chlorophyll molecule is (a) head 15 × 15 Å, tail 25 Å (b) head 20 × 20 Å, tail 25 Å (c) head 15 × 15 Å, tail 20 Å (d) head 10 × 12 Å, tail 25 Å.
Last Answer : (c) head 15 × 15 Å, tail 20 Å
Description : Which is wrong about nucleic acids? (a) DNA is single stranded in some viruses. (b) RNA is double stranded occasionally. (c) Length of one helix is 45 Å in B-DNA. (d) One turn of Z-DNA has 12 bases
Last Answer : (c) Length of one helix is 45 Å in B-DNA
Description : Angstrom (Å) is equal to (a) 0.01 mm (b) 0.001 mm (c) 0.0001 mm (d) 0.00001 mm
Last Answer : (b) 0.001 mm
Description : What is the bond length of a carbon-carbon double bond? (a) 1.20 Å (b) 1.34 Å (c) 1.54 Å (d) 1.68 Å
Last Answer : 1.34 Å
Description : What type of gate is represented by the output Boolean expression R T Å ?
Last Answer : Exclusive NOR (X-NOR).
Description : If a DNA contains 1000 base pairs, what would be its length? a) 3400 Å b) 34000 Å c) 6800 d) 1000 Å
Last Answer : a) 3400 Å