Description : When a wave is reflected from a surface, energy is reflected. When is the reflection of energy the greatest?
Last Answer : When the wave is nearly parallel to the reflecting surface.
Description : A light wave enters a sheet of glass at a perfect right angle to the surface. Is the majority of the wave reflected, refracted, transmitted, or absorbed?
Last Answer : Transmitted.
Description : A sound wave that is reflected back toward the source is known as what type of sound?
Last Answer : Echo.
Description : What factor determines whether a radio wave is reflected or refracted by the ionosphere?
Last Answer : Thickness of ionized layer.
Description : How is the energy transferred in a wave without transfer of particles of the medium?
Last Answer : When a wave propagates in a medium, the particles of the medium vibrate about their mean position and the energy is transferred without the transfer of particles of the medium.
Description : What is one of the major reasons for the fading of radio waves which have been reflected from a surface?
Last Answer : Shifting in the phase relationships of the wave.
Description : Find the permittivity of the surface when a wave incident at an angle 60 is reflected by the surface at 45 in air. a) 1.41 b) 3.5 c) 2.2 d) 1.73
Last Answer : d) 1.73
Description : A wave incident on a surface at an angle 60 degree is having field intensity of 6 units. The reflected wave is at an angle of 30 degree. Find the field intensity after reflection. a) 9.4 b) 8.4 c) 10.4 d) 7.4
Last Answer : c) 10.4
Description : What happens to reflected energy that enters a directional coupler that is designed to sample incident energy?
Last Answer : . The reflected energy adds at the absorbent material and is absorbed.
Description : Extended heat transfer surface like fins are used to increase the heat transfer rate. Fin efficiency is defined as the ratio of heat transferred across the fin surface to the theoretical heat transfer ... (C) Temperature of the fin end (D) Constant temperature equal to that of the base
Last Answer : (D) Constant temperature equal to that of the base
Description : What occurs as energy is transferred through a wave?
Last Answer : Water particles are set in circular motion.
Description : In fiber-to-fiber connections, Fresnel reflection is one source of coupling losses. Light is reflected back into the source fiber and is lost. What causes Fresnel reflection?
Last Answer : A step change in refractive index that occurs at fiber joints, caused by fiber separation.
Description : Microwaves can be focused and reflected in the same way as what other type of waves?
Last Answer : Light waves.
Description : A wavefront undergoes a phase change as it travels along the fiber. If the wavefront transverses the fiber twice and is reflected twice and the total phase change is equal to 1/2 p, will the wavefront disappear? If yes, why?
Last Answer : Yes, the wavefront will disappear because the total amount of phase collected must be an integer multiple of 2 p. (If the propagating wavefronts are out of phase, they will disappear. ... interfere with the wavefronts out of phase. This type of interference is called destructive interference.)
Description : What condition causes a light ray to be totally reflected back into its medium of propagation?
Last Answer : Total internal reflection occurs when the angle of refraction approaches 90 degrees. This condition occurs when the angle of incidence increases to the point where no refraction is possible.
Description : When light strikes a piece of white paper, the light is reflected in all directions. What do we call this scattering of light?
Last Answer : Diffusion.
Description : An electric drill transfer some energy wastefully . aside from heat , what else carries the energy that is transferred wastefully?
Last Answer : sound waves
Description : Second law of thermodynamics is concerned with the (A) Amount of energy transferred (B) Direction of energy transfer (C) Irreversible processes only (D) Non-cyclic processes only
Last Answer : (B) Direction of energy transfer
Description : What is an energy that can be transferred from one object to another causing a change in temperature of each object? A. Power B. Heat transfer C. Heat D. Work
Last Answer : Heat
Description : What three factors must be considered in the transmission of a surface wave to reduce attenuation?
Last Answer : (a) electrical properties of the terrain (b) frequency (c) polarization of the antenna
Description : What is the best type of surface or terrain to use for radio wave transmission?
Last Answer : Radio horizon is about 1/3 farther.
Description : All the power sent down a transmission line from a transmitter can be transferred to an antenna under what optimum conditions?
Last Answer : When the characteristic impedance of the transmission line and the load impedance are equal.
Description : Whenever data is transferred between devices, it involves the exchange of prearranged signals; what is this process called?
Last Answer : Handshaking.
Description : What is the percentage of radiant energy reflected back by surface called?
Last Answer : Albedo
Description : Out of 100 kcal/second of incident radiant energy on the surface of a thermally transparent body, 300 kcal/second is reflected back. If the transmissivity of the body is 0.25, the emissivity of the surface will be (A) 0.35 (B) 0.45 (C) 0.55 (D) 0.85
Last Answer : (B) 0.45
Description : 1. Which vitamin is necessary for blood clotting? 2. Which can be abolished but not dissolved? 3. What does Talc contains? 4. What is the percentage of radiant energy reflected back by ... which countries? 20. The extent of the Delhi Sultanate empire was the greatest during which reign?
Last Answer : Answer : 1. Vitamin K 2. State Legislative Council 3. Magnesium, silicon and oxygen 4. Albedo 5. Nalanda 6. Vijay Kelkar 7. 1 percent 8. Lemurs 9. Mild rainfall 10. Mahayana sect 11. From ... 16. National income 17. Liver 18. Both Houses of Parliament 19. Sumatra and Malaysia 20. Alauddin Khilji
Description : The sinusoidal wave `y(x,t) = ym sin(kx-omegat)` is incident on the fixed end of a string at `x = L`. The reflected wave is given by :-
Last Answer : The sinusoidal wave `y(x,t) = ym sin(kx-omegat)` is incident on the fixed end of a string at `x = L` ... (kx+omegat-kL)` D. `y_(m)sin(kx+omegat-2kL)`
Description : What is the type of wave is reflected by particles in the ionosphere?
Last Answer : Feel Free to Answer
Description : When a light wave is reflected from a mirror, there is a change in its
Last Answer : Amplitude
Description : When a light wave is reflected from a mirror, there is a change in its – (1) frequency (2) amplitude (3) wavelength (4) velocity
Last Answer : (2) amplitude Explanation: When a light wave is reflected from an object, it changes not only its amplitude but also its phase according to the properties of the object at a particular point. The velocity and momentum are just reversed in another direction.
Description : When electromagnetic wave are propagated through a waveguide, they A. are reflected from the walls but do not travel along them B. travel along all four walls of the waveguide C. travel along the broader walls of the guide D. travel through the dielectric without touching the walls
Last Answer : A. are reflected from the walls but do not travel along them
Description : Find the reflection coefficient of a wave with an incident electric field of 5 units and reflected electric field of 2 units. a) 2.5 b) 0.4 c) 0.8 d) 1.2
Last Answer : b) 0.4
Description : An Electromagnetic wave falls on to a boundary between two losses less homogeneous media with different refractive indices, a part of the wave is reflected back to the incident medium and the rest is transmitted ... A) Fresnel reflection (B) Fresnel refraction (C) Snell's law (D) None of these
Last Answer : Answer: Option A
Description : When a light wave is reflected from a mirror, there is a change in its?
Description : When a wave strikes a vertical breakwater in deep water, it is reflected back and on meeting another advancing wave of similar amplitude merges and rises vertically in a wall of water. This phenomenon is called (A) Surf (B) Clapotis (C) Fetch (D) Swell
Last Answer : (B) Clapotis
Description : When a light wave suffers reflection at the interface between air and glass medium, the change of wavelength of the reflected wave in air is equal to (a) 0 (b) λ/2 (c) λ (d) 2λ
Last Answer : (b) λ/2
Description : When a light wave suffers reflection at the interface between air and glass medium, the change of phase of the reflected wave in air is equal to (a) 0 (b) π (c) 2π (d) π/2
Last Answer : (b) π
Description : When a light wave suffers reflection at the interface between air and glass medium, the change of phase of the reflected wave in air is equal to A. 0 B. π C.2 π D.π /2
Last Answer : B. π
Description : When a light wave is reflected from a mirror, there is a change in its (1) frequency (2) amplitude (3) wavelength (4) velocity
Last Answer : amplitude
Description : Which of the following is not a unit of mass transfer co-efficient? (A) Moles transferred/ [(time) (area) (mole fraction)] (B) Moles transferred/ [(time) (area) (mass A/mass B)] (C) Moles transferred/ [(time) (area) (pressure)] (D) None of these
Last Answer : (D) None of these
Description : Pick out the wrong statement. (A) The condensing film co-efficient is about 3 times lower for vertical condenser as compared to the equivalent horizontal condenser for identical situation ( ... in a heat exchanger is controlled by the value of the film co-efficient, which is higher
Last Answer : (D) Overall heat transfer co-efficient in a heat exchanger is controlled by the value of the film co-efficient, which is higher
Description : Convective heat transfer, in which heat is transferred by movement of warmed matter is described by (A) Fourier's law (B) Newton's law of cooling (C) Fick's law (D) None of these
Last Answer : (B) Newton's law of cooling
Description : The SCSS account transferred one Post office to another post office a) Rs 5/- per lac will be charged where the deposit is Rs 1 lac and above b) Rs 10/- per lac will be charged where the deposit is Rs 1 ... No fee will be charged d) Both the A and B( The fee will be paid by cash through pay in slip
Last Answer : d) Both the A and B( The fee will be paid by cash through pay in slip
Description : Artificial Insemination means (a) artificial introduction of sperms of a healthy donor into the vagina (b) introduction of sperms of a healthy donor directly into the ovary (c) transfer of sperms of a ... of sperms of husband to a test tube containing ova. (NEET 2013) 40. The stage transferred
Last Answer : (a) artificial introduction of sperms of a healthy donor into the vagina
Description : If a government servant from whom a recovery is ordered , is transferred to the jurisdiction of disbursing officer a. recovery should be completed before his transfer . b. order of recovery should be passed on to that disbursing officer c. None of these
Last Answer : b. order of recovery should be passed on to that disbursing officer
Description : Transformation refers to a. Using A Virus To Transfer DNA Fragments. b. DNA Fragments Transferred Between Live Donor And Recipient Cells. c. The Formation of an F- Recombinant Cell. d. The Transfer of Naked Fragments of DNA
Last Answer : b. DNA Fragments Transferred Between Live Donor And Recipient Cells.
Description : The flow of a fluid when heat is transferred by convection. a. placidity b. mass flow c. convection current d. heat transfer
Last Answer : convection current
Description : Which of the following can be transferred under the Transfer of Property Act, 1882? a) An easement along with the dominant heritage b) Political pension c) Succession d) Stipends allowed to the civil pensioners of the Government
Last Answer : a) An easement along with the dominant heritage
Description : „Transfer Payments‟ are (a) Payments made to a factor of production ; (b) Payments transferred from one sector to another; (c) Payments made for no return service ; (d) Payments made by government of one country to another
Last Answer : (c) Payments made for no return service ;
Description : If a wave's electric lines of force rotate through 360 degrees with every cycle of rf energy, what is the polarization of this wave?
Last Answer : Circular polarization.