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 : When a wave is reflected from a surface, energy is transferred. When is the transfer of energy greatest?
Last Answer : When the incident wave is nearly parallel with the surface.
Description : What factor determines whether a radio wave is reflected or refracted by the ionosphere?
Last Answer : Thickness of ionized layer.
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 : 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 : 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 : 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 : An incident ray can be defined as ∙ A. a light ray reflected from a flat surface ∙ B. a light directed toward a surface ∙ C. a diffused light ray ∙ D. a light ray that happens periodically
Last Answer : ∙ B. a light directed toward a surface
Description : The echo (reflected sounD. will be distinctly heard only at ordinary temperatures if the distance of the reflecting surfaces from the source of sound is at least ----? A. 1120 ft B. 120 ft C. 56 ft (Answer) D. 100 ft E. None of these
Last Answer : C. 56 ft (Answer)
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 : In acoustics, _____ is the apparent change in frequency or pitch when a sound source moves either toward or away from a listener. A. flanking B. reverberation C. Doppler effect D. echo
Last Answer : C. Doppler effect
Description : Microwaves can be focused and reflected in the same way as what other type of waves?
Last Answer : Light waves.
Description : What is the type of wave is reflected by particles in the ionosphere?
Last Answer : Feel Free to Answer
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 : 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 : 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 : 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 : 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 : 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 : 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 : When a light wave is reflected from a mirror, there is a change in its?
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 : In reference to the schematic symbol for a diode, do electrons flow toward or away from the arrow?
Last Answer : Toward the arrow.
Description : How is the electron beam of a three-cavity klystron accelerated toward the drift tube?
Last Answer : A large negative pulse is applied to the cathode.
Description : To measure incident power, you must rotate the coupler detector of the wattmeter so that the arrow indicating power flow points toward which end of the transmission line?
Last Answer : Load.
Description : An electron moves into the electrostatic field between a positive charge and a negative charge. Toward which charge will the electron move?
Last Answer : Toward the positive charge.
Description : Sound waves transmitted from a source are sometimes weak when they reach the detector. What instrument is needed to boost the weak signal?
Last Answer : An amplifier.
Description : What characteristic is determined by the time required for a voltage wave to travel from the input end of an artificial transmission line to the output end and back again?
Last Answer : Pulse width
Last Answer : Pulse width.
Description : A certain part of energy received from the sun, is reflected back to space by the earth known as?
Last Answer : Ans. Albedo
Description : Which type of optical source usually lacks reflective facets and in some cases are designed to suppress reflections back into the active region?
Last Answer : LED.
Description : Where are the current nodes in a half-wave antenna? A. At the ends B. At the center C. Three-quarters of the way from the feed point toward the end D. One-half of the way from the feed point toward the end
Last Answer : A. At the ends
Description : Where are the voltage nodes in a half-wave antenna? A. At the ends B. Three-quarters of the way from the feed point toward the end C. One-half of the way from the feed point toward the end D. At the feed point
Last Answer : D. At the feed point
Description : When we hear a sound, we can identify its source from ______. (1) wave length of sound (2) the overtones present in the sound (3) the intensity of sound (4) the amplitude of sound
Last Answer : (2) the overtones present in the sound Explanation: An overtone is any frequency higher than the fundamental frequency of a sound. Using the model of Fourier analysis, the fundamental and the overtones together are called partials.
Description : The time interval between the original sound and the reflected sound for an echo to be
Last Answer : heard is >=0.1s.
Description : Speed of sound in water is 1500 m s-1, depth of water when reflected sound waves are detected after 0.40 s is A. 700 m B. 600 km C. 600 m D. 750 km
Last Answer : 600 m
Description : Remote sensing techniques make use of the properties of ___________ emitted, reflected or diffracted by the sensed objects: (A) Electric waves (B) Sound waves (C) Electromagnetic waves (D) Wind waves
Last Answer : Answer: Option C
Description : To hear distinct echo each time interval between original sound and reflected sound must be a)0.2sec b)1sec c)2sec d)0.1sec
Last Answer : d)0.1sec
Description : A radiating source that radiates energy equally in all directions is known as what type of radiator?
Last Answer : Isotropic radiator.
Description : A radiating source that radiates energy stronger in one direction than another is known as what type of radiator?
Last Answer : Anisotropic radiator.
Description : The ambulance is moving toward you and your sound technology measures the pitch at 645 hertz. The speed of the ambulance is therefore ______ m/s.?
Last Answer : *this is the full question not the answer* Suppose you’re standing on a sidewalk and down the street is an ambulance parked; it’s siren is a 600 Hz sound like it louder, Quieter, louder, quieter ... do use the facts given above to answer this:The ambulance is moving toward you and your sound te
Description : What did the Japanese always look toward as a food source?
Last Answer : Need answer