Description : By the transition of inner shell electrons in heavy atoms, high energy photons are emitted which are a) gamma rays b) X-rays c) radio waves d) photon rays
Last Answer : b) X-rays
Description : A hydrogen atom in state `n = 6` makes two successive transition and reaches the ground state in the first transition a photon of `1.13eV` is emitted
Last Answer : A hydrogen atom in state `n = 6` makes two successive transition and reaches the ground state in the ... is the value of n in the intermediate state?
Description : Pick up the correct statement from the following: (A) The minimum frequency of light for which no electrons are emitted, is called threshold frequency (B) Polarising angle of glass is 57.5° (C) At the polarising angle, the reflected and refracted rays are orthogonal (D) All the above
Last Answer : Answer: Option D
Description : In which of the following transition, the wavelength will be minimum `:`
Last Answer : In which of the following transition, the wavelength will be minimum `:` A. n=6 to n=4 B. n=4 to n=2 C. n=3 ton=1 D. n=2 to n=1
Description : The radius of curvature provided along a transition curve, is (A) Minimum at the beginning (B) Same throughout its length (C) Equal to the radius of circular curve (D) Varying from infinity to the radius of circular curve
Description : In case of a hair pin bend of a highway, (A) Minimum radius of inner curve is 14 m (B) Minimum radius of transition is 15 m (C) Circular compound curve may be provided (D) All the above
Description : Given a Non-deterministic Finite Automation (NFA) with states p and r as initial and final states respectively transition table as given below The minimum number of states required in Deterministic Finite Automation (DFA) equivalent to NFA is (A) 5 (B) 4 (C) 3 (D) 2
Last Answer : (C) 3
Description : The nucleus `._(92)^(235)U` decays according to `._(92)^(238)U rarr ._(92)^(234)Th + ._(2)^(4)He`. Calculate the kinetic energy of the emitted `alpha`
Last Answer : The nucleus `._(92)^(235)U` decays according to `._(92)^(238)U rarr ._(92)^(234)Th + ._(2)^(4)He`. ... kg " " ._(2)^(4)He = 6.64807 xx 10^(-27)`
Description : Taking the values of atomic masses from the tables, find the maximum kinetic energy of beta-particles emitted by `Be^(10)` nuclei formed directly in t
Last Answer : Taking the values of atomic masses from the tables, find the maximum kinetic energy of beta- ... )` nuclei formed directly in the ground state.
Description : An electron in an excited hydrogen atom acquired an energy of 12.1 eV. To what energy level did it jump? How many spectral lines may be emitted in the
Last Answer : An electron in an excited hydrogen atom acquired an energy of 12.1 eV. To what ... to lower energy level? Calculate the corresponding wavelengths.
Description : Energy emitted per second per unit area by Rigal star in Constellation Orion is 17000 times that emited by the sun. What is the surface temperature of
Last Answer : Energy emitted per second per unit area by Rigal star in Constellation Orion is 17000 times that emited by ... star if that of the sun is `6000K`?
Description : How is solar energy absorbed and emitted by Earth's surface?
Last Answer : Need answer
Description : The energy emitted by the Sun is due to (1) Chemical reaction (2) Nuclear fission (3) Nuclear fusion (4) All of the above
Last Answer : (3) Nuclear fusion Explanation: The spectrum of the Sun's solar radiation is close to that of a black body with a temperature of about 5,800 K. The Sun emits Electromagnetic radiation across ... converted to lower energy photons before they reach the Sun's surface and are emitted out into space.
Description : Which is the proper measurement of average power emitted by a pulsed laser? a. Energy x time b. Pulse energy x repetition rate c. Pulse energy / repetition rate d. Peak power x pulse length
Last Answer : b. Pulse energy x repetition rate
Description : Pick out the wrong statement: (A) With change in temperature, the radiant energy emitted by a black body remains unchanged (B) Absorptivity of a body approaches unity in case of diffuse reflection (C) Absorptivity of ... unity (D) Value of Stefan-Boltzmann constant is 4.876 10 -8 KCal/m2 .hr.°K4
Last Answer : (A) With change in temperature, the radiant energy emitted by a black body remains unchanged
Description : . Radiation energy is emitted by all the substances, which are above (A) 0°K (B) 0°C (C) 100°C (D) Room temperature
Last Answer : (A) 0°K
Description : Which is the proper measurement of average power emitted by a pulsed laser? ∙ a. Energy x time ∙ b. Pulse energy x repetition rate ∙ c. Pulse energy / repetition rate ∙ d. Peak power x pulse length
Last Answer : ∙ b. Pulse energy x repetition rate
Description : On average, how do low clouds affect the surface temperature (compared to a clear sky)? (a) Low clouds warm the surface by increasing the greenhouse effect (b) Low clouds cool the surface by ... surface by increasing the albedo (d) It depends on whether they are comprised of ice or liquid water
Last Answer : (c) Low clouds cool the surface by increasing the albedo
Description : On average, how do high clouds affect the surface temperature (compared to a clear sky)? (a) High clouds warm the surface by increasing the greenhouse effect (b) High clouds cool the surface ... surface by increasing the albedo (d) It depends on whether they are comprised of ice or liquid water
Last Answer : High clouds warm the surface by increasing the greenhouse effect
Description : The X-rays emitted in inner shell transitions are called _____ as their energy depends upon the type of target material. a) gamma rays b) special X-rays c) Characteristic X-rays d) continuous X-rays
Last Answer : c) Characteristic X-rays
Description : Radiant energy emitted from a blackbody is only a function of what?
Last Answer : ANSWER: TEMPERATURE
Description : To develop the correct mathematical description of the distribution of radiated energy of a blackbody with respect to wavelength for a given temperature, Planck found it necessary to assume that the molecular ... units or quanta y) radiant energy in a continuous form z) none of the above.
Last Answer : ANSWER: X -- RADIANT ENERGY IN DISCRETE UNITS OR QUANTA
Last Answer : Nuclear fusion
Description : A hydrogen atom in a state of binding energy 0.85 eV makes a transition to a state of excitation energy of 10.2 eV . Find the energy and wavelength of
Last Answer : A hydrogen atom in a state of binding energy 0.85 eV makes a transition to a state of ... . Find the energy and wavelength of photon emitted.
Description : Consider a hydrogen-like atom whose energy in nth excited state is given by `E_(n) = (13.6 Z^(2))/(n^(2))` When this excited makes a transition from e
Last Answer : Consider a hydrogen-like atom whose energy in nth excited state is given by `E_(n) = (13. ... number of atom and the intial state or excitation.
Description : A hydrogen atom in a having a binding of `0.85eV`makes transition to a state with excited energy `10.2eV`(a) identify the quantum number n of theupper
Last Answer : A hydrogen atom in a having a binding of `0.85eV`makes transition to a state with excited ... (b) Find the wavelength of the emitted radiation
Description : Solar energy is converted into chemical energy during – (1) Combustion (2) Transition (3) Photosynthesis (4) Fusion
Last Answer : (3) Photosynthesis Explanation: Photosynthesis in plants converts radiant energy from the sun into chemical energy in the form of glucose (sugar) using electrons and protons from water. Plants take in water, carbon dioxide, and sunlight and turn them into glucose and oxygen.
Description : Which among the following is not a characteristic of transition metals? (1) Tendency to gain electrons (2) Low electronegativity (3) Low ionization energy (4) Malleability
Last Answer : (1) Tendency to gain electrons Explanation: The transition metals have a tendency to lose electrons. Since the electrons in the highest energy level are actually on a lower principal enemy number than the ... ions, the 4s electrons are always lost first; so, they form only cations (positive ions).
Description : Which among the following is not a characteristic of transition metals? (1) Tendency to gain electrons (2) Low electro negativity (3) Low ionization energy (4) Malleability
Last Answer : (1) Tendency to gain electrons Explanation: The transition metals have a tendency to lose electrons. Since the electrons in the highest energy level are actually on a lower principal energy number than the ... makes it relatively easy to lose some or all of their electrons to land in stable state.
Description : The figure given Progress of Reaction Product Substrate B A C D below shows the conversion of a substrate into product by an enzyme. In which one of the four options (A-D ... enzyme enzyme (d) Activation Transition Activation Potential energy state energy energy with without enzyme enzyme
Last Answer : (b) Transition Potential Activation Activation state energy energy energy without with enzyme enzyme
Description : At a given value of E/R (ratio of activation energy and gas constant), the ratio of the rate constants at 500°K and 400°K is 2, if Arrhenius law is used. What will be this ratio, if transition state theory is used with the same value of ‘E/R’? (A) 1.6 (B) 2 (C) 2.24 (D) 2.5
Last Answer : (D) 2.5
Description : The reaction step that has its transition state at the highest point on the reaction coordinate is the called the __________. (a) rate-determining step (b) activation energy (c) transition step (d) product favored step
Last Answer : rate-determining step
Description : Increasing the carbon content of steel (A) Reduces the upper shelf energy (B) Increasing the ductility transition temperature (C) Decreases brittleness (D) Decreases hardness
Last Answer : (B) Increasing the ductility transition temperature
Description : Within a given period of the periodic table, the element with the lowest ionization energy is: w) transition metal x) alkali metal y) halogen z) noble gas
Last Answer : ANSWER: X -- ALKALI METAL
Last Answer : Tendency to gain electrons
Description : What is the harmful ray emitted from color television ?
Last Answer : The harmful rays emitted from color television are called gamma rays.
Description : What ray is emitted from cobalt _60 ?
Last Answer : Gamma rays are emitted.
Description : What is the gas emitted during respiration ?
Last Answer : : Carbon dioxide gas is released in the seventh breath.
Description : From which part of the atom e- particle is emitted ?
Last Answer : α- particles are emitted from the nucleus of an atom of radioactive element .
Description : From which part of the atom of the radioactive element is the radioactive ray emitted ?
Last Answer : The radioactive ray is emitted from the nucleus of the atom of the radioactive element.
Description : What are the ways in which electrons are emitted from metal ?
Last Answer : The methods of emission of electrons from metal surface are - ( i) thermal ion emission , (ii) light electric emission ( iii) field emission ( iv) secondary emission.
Description : What are the rays emitted from radioactive material ? What are their names ?
Last Answer : Three types of rays are emitted from the nucleus of radioactive material. Their names are ফাalpha ( α) ray , beta ( ß) ray and gamma ( γ) ray.
Description : `beta` rays are emitted from the _________.
Last Answer : `beta` rays are emitted from the _________.
Description : Cathode rays in a discharge tube are made up of electrons emitted from the plate that is connected to the negative terminal of the DC voltage source.
Last Answer : Cathode rays in a discharge tube are made up of electrons emitted from the plate that is connected to the negative terminal of the DC voltage source.
Description : Carbon monoxide emitted by automobiles directy contributes to
Last Answer : Carbon monoxide emitted by automobiles directy contributes to A. Water pollution B. Noise pollution C. Land pollution D. All the people
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 : Polonium -210 is pollutant emitted from
Last Answer : Polonium -210 is pollutant emitted from A. Laboratory radio-isotopes B. Coolant water of reactors C. Automobile exhausts D. Thorium rich sands.
Description : Carbon monoxide, emitted by automobiles prevents transport of oxygen in body due to
Last Answer : Carbon monoxide, emitted by automobiles prevents transport of oxygen in body due to A. ... haemoglobin D. forming stable compound with haemoglobin.
Description : When the electron of a hydrogen atom jumps from the n=4 to the n=1 state , the number of all pos - sible spectral lines emitted is :-
Last Answer : When the electron of a hydrogen atom jumps from the n=4 to the n=1 state , the number of all pos - sible spectral ... is :- A. 15 B. 6 C. 3 D. 4
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