Description : What causes dc bias energy to be absorbed by avalanche electrons and given up to the microwave field applied to an avalanche transit-time diode?
Last Answer : The negative-resistance property.
Description : What interaction causes energy to travel down a waveguide?
Last Answer : The interaction of the electric and magnetic fields.
Description : The termination of heparin activity by protamine sulfate is due to (a) A chelating action (b) The inhibition of gastrointestinal absorption of heparin (c) The displacement of heparin-plasma protein binding (d) An acid-base interaction (e) The prothrombin-like activity of protamine
Last Answer : Ans: D
Description : Interaction that causes an object's momentum to change is A. velocity B. acceleration C. power D. force
Last Answer : force
Description : What are the electrons called that give up energy to the ac field in a magnetron?
Last Answer : Working electrons.
Description : What is the term used to identify the amount of field strength required to cause the electrons to just miss the plate and return to the filament in a circular orbit?
Last Answer : The critical value of field strength
Description : If the constant-speed electrons in a reflex klystron remain in the repeller field for 1 3/4 cycles, what is the mode of operation?
Last Answer : Mode 2.
Description : The constant-speed electrons of an electron bunch in a reflex klystron must remain in the repeller field for what minimum time?
Last Answer : Three-quarter cycle.
Description : In Bohr's theory of the atom, what force was responsible for holding the electrons in their orbit?
Last Answer : ANSWER: COULOMB FORCE or THE FORCE OF ATTRACTION BETWEEN THE PROTON (NUCLEUS) AND THE ELECTRON
Description : What portion of an electron gun causes the electrons to accelerate or decelerate?
Last Answer : The buncher grids.
Description : What methods are used to prevent unwanted component interaction?
Last Answer : Ground planes, shielding, and component placement.
Description : Scattering losses are caused by the interaction of light with density fluctuations within a fiber. What are the two scattering mechanisms called when the size of the density fluctuations is (a) greater than and (b) less than one-tenth of the operating wavelength?
Last Answer : . (a) Mie scattering; (b) Rayleigh scattering.
Description : Use the information and data given below to answer the questions Stronger intermolecular forces result in higher boiling point Strength of London forces increases with the number of electrons in the molecule ... here? (c) Why is the boiling point of HF highest while that of HCl lowest?
Last Answer : Ans :( a) In the molecules HCl, HBr and HI, dipole-dipole interaction and London forces are present. (b) Dipole moment of HCl > HBr > HI but boiling point of HCl < HBr
Description : The reason why materials appear colored is (a) The selective absorption of spectral colors (b) The interaction between the light and the electrons of the dye molecules (c) The composition of the white light from various spectral colors (d) All of these
Last Answer : All of these
Description : Calculate the binding energy of the lithium atom `(._(3)^(7)Li)` from the following data: `{:("mass of proton",= 1.00759,am u,),("mass of neutron",= 1
Last Answer : Calculate the binding energy of the lithium atom `(._(3)^(7)Li)` from the following data: `{:("mass of ... "mass of lithium atom",= 7.01818,am u,):}`
Description : Find the binding energy of an electron in the ground state of a hydrogen like atom in whose spectrum the third Balmer line is equal to 108.5 mm.
Last Answer : Find the binding energy of an electron in the ground state of a hydrogen like atom in whose spectrum the third Balmer line is equal to 108.5 mm.
Description : Calculate the separation of the particles and the binding energy of a positronium (an atom consisting of an electron and a position revolving around t
Last Answer : Calculate the separation of the particles and the binding energy of a positronium (an atom ... position revolving around their centre of mass).
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 : 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 : Critical energy should be __________ the neutron binding energy of the atom in order to initiate a nuclear fission. (A) Equal to (B) Less than (C) More than (D) Either more or less
Last Answer : (C) More than
Description : The lone pair of electrons at one of the ring nitrogens in the given amino acid makes a potential ligand, which is important in binding the iron atoms in hemoglobin: (A) Tryptophan (B) Threonine (C) Histidine (D) Serine
Last Answer : Answer : C
Description : Hormone receptors that stimulate cAMP production (A) are part of a complex of two proteins that transform the external signal into internal cAMP production (B) are proteins distinct and separate from those ... binding of the hormone (D) are not very specific and bind a number of different hormones
Last Answer : Answer : B
Description : What will be the effect upon an electron traveling in the opposite direction to the lines of force in an electrostatic field?
Last Answer : The electron will be accelerated.
Description : What is the term applied to the rate at which a mechanical or electrical force causes motion?
Last Answer : Power
Description : What is the name of the force that causes electrons to move away from the nucleus?
Last Answer : Need answer
Description : The force that causes free electrons to move in a conductor as electric current flow is called a/an _____________. A. resistant force B. electromotive force C. inductive force D. dielectric force
Last Answer : Answer: B
Description : Find the force of interaction between 60 stat coulomb and 37.5 stat coulomb spaced 7.5cm apart in transformer oil(εr=2.2) in 10 -4 N, a) 8.15 b) 5.18 c) 1.518 d) 1.815
Last Answer : d) 1.815
Description : Choose the wrong statement (A) Viscosity of a fluid is that property which determines the amount of its resistance to a shearing force (B) Viscosity is due primarily to interaction between fluid molecules (C) Viscosity of liquids decreases with increase in temperature (D) Viscosity of liquid
Last Answer : Answer: Option D
Description : In a three-phase, squirrel-cage type, induction motor the rotating magnetic field is established by the _____________. A. current induced in the rotor windings B. application of a three-phase voltage ... caused by the induced current in the squirrel-cage bars with the magnetic field of the stator
Description : To minimize magnetic field interaction between electrical conductors in physical proximity, it is best to keep them ___________________. A. parallel and as close as possible to each other B. at right angles ... practicable from each other D. at right angles and as far as practicable from each other
Last Answer : Answer: D
Description : Mixture of glyphosate with 2,4-D on field bindweed had interaction of the type a). Synergistic b). Antagonistic c). Additive d). Enhancement
Last Answer : a). Synergistic
Description : The basis of the technique of chromatography for separating components of a mixture is? A. the differing movement of particles of different mass in an electrical field B. the interaction of the ... infrared radiation by the components. D. the deflection of charged particles in a magnetic field.
Last Answer : the interaction of the components with a stationary and a mobile phases
Description : Work required for compression of a gas contained in a cylinder is 7000 kJ. During compression, heat interaction of 3000 kJ causes the surroundings to be heated. Internal energy change of the gas during the compression is __________ kJ. (A) +4000 (B) -4000 (C) 10000 (D) -10000
Last Answer : (A) +4000
Description : ________________ causes pharmacodynamic drug interaction. a) Gastric motility changes. b) Stimulation of metabolism. c) Alteration of pH of GIT. d)Interactions at receptor site.
Last Answer : d)Interactions at receptor site.
Description : What determines the chemical activity of an atom?
Last Answer : The number of electrons in the valence shell.
Description : What is the main difference in the energy arrangement between an isolated atom and the atom in a solid?
Last Answer : The energy levels of an atom in a solid group together to form
Description : What is the outer shell of an atom called?
Last Answer : The valence shell.
Description : What are the three particles that comprise an atom and state the type of charge they hold?
Last Answer : Electrons-negative, protons-positive, and neutrons-neutral.
Description : What determines the valence of an atom?
Last Answer : The number of electrons in the outer shell.
Description : Erythromycin binds to 50 S ribosomal sub unit and (A) Inhibits binding of amino acyl tRNA (B) Inhibits Peptidyl transferase activity (C) Inhibits translocation (D) Causes premature chain termination
Description : Insufficient washing of sand grains in a rapid sand filter causes (A) Air binding (B) Shrinkage of filtering media (C) Mud balls (D) Expansion of filtering media
Last Answer : (C) Mud balls
Description : What element controls the number of electrons striking the screen?
Last Answer : Control grid.
Description : What is the name of the area in a PN junction that has a shortage of electrons and holes?
Last Answer : Depletion region
Description : In reference to the schematic symbol for a diode, do electrons flow toward or away from the arrow?
Last Answer : Toward the arrow.
Description : What is the name given to a piece of pure semiconductor material that has an equal number of electrons and holes?
Last Answer : Intrinsic.
Description : What is the term used to describe the sharing of valence electrons between two or more atoms?
Last Answer : Covalent bonding.
Description : What happens to the electrons of a gallium-arsenide semiconductor when they move from the normal low-energy conduction band to the high-energy conduction band?
Last Answer : The electrons become immobile.
Description : A magnetron will produce oscillations when the electrons follow what type of path?
Last Answer : Circular.
Description : The electrons in the beam of a klystron are speeded up by a high dc potential applied to what elements?
Last Answer : The accelerator grid and the buncher grids.
Description : How is a beam of electrons velocity-modulated?
Last Answer : By alternately speeding up or slowing down the electrons