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

1 Answer

Answer :

Answer: Option D

Related questions

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 : Winch of the following is not true about X-rays? (1) have low penetrating power (2) travel with the speed of light (3) Can be reflected or refracted (4) can affect photographic plates

Last Answer : (1) have low penetrating power Explanation: X-rays and gamma rays are photons, i.e. high-energy light-waves. When emitted by a source, for example, radium or cobalt, located outside the body, they ... they can be used in diagnostic medicine to image human bones or human organs made opaque by a dye.

Description : Which of the following is not true about X-rays? (1) have low penetrating power (2) travel with the speed of light (3) Can be reflected or refracted (4) can affect photographic plates

Last Answer : have low penetrating power

Description : Pick up the correct statement from the following: (A) A graphical representation of spectral reflectance verses the various growth stages of a crop, depicts a phonologic pattern B) The changes in ... characteristic of the object which helps in the identification of the object (D) All of these

Last Answer : Answer: Option D

Description : The Snell’s law can be derived from which type of incidence? a) Incidence angle b) Reflected angle c) Refracted angle d) Oblique incidence

Last Answer : d) Oblique incidence

Description : Find the maximum angle of refraction when a light ray is refracted from glass `(mu= 1.50)` to air.

Last Answer : Find the maximum angle of refraction when a light ray is refracted from glass `(mu= 1.50)` to air.

Description : The minimum angle of incidence at which the light ray may strike the interface of two media and result in an angle of refraction of 90 degrees or greater. ∙ A. optimum angle ∙ B. angle of refraction ∙ C. refracted angle ∙ D. critical angle

Last Answer : D. critical angle

Description : The interference in thin films is because (a) The film reflects some light (b) The film is thin enough so that refracted ray is close to reflected ray (c) The reflected ray undergo path change of λ/2 (d) All of above

Last Answer : (d) All of above

Description : When light falls on shiny surface it gets __________ . a) refracted b)reflected c)bent d)nothing happens

Last Answer : b)reflected

Description : The minimum frequency required to eject electrons from a metallic surface is called a) Critical frequency b) Peak value of frequency c) Threshold frequency d)Photo frequency

Last Answer : c) Threshold frequency

Description : As shown in Fig. `PQ` is a ray incident on prism `ABC`. Show the corresponding refracted and emergent rays. The critical angle for the material of the

Last Answer : As shown in Fig. `PQ` is a ray incident on prism `ABC`. Show the corresponding refracted and ... is refractive index of the material of prism ? .

Description : On a rainy day, small oil films on water show brilliant colors'. This is due to A. dispersion B. interference C. diffraction D. Polarization 49.The critical angle for a beam of light ... A. absorbed B. totally reflected C. Partially reflected and partially transmitted D. Totally transmitted

Last Answer : C. Partially reflected and partially transmitted

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 : The law that states “When visible light of high frequency electromagnetic radiation illuminates a metallic surface, electrons are emitted” is known as ____________. ∙ A. Einstein law of photon ∙ B. Marconi’s law ∙ C. Maxwell’s law ∙ D. Plank’s law

Last Answer : D. Plank’s law

Description : “When visible light of high frequency electromagnetic radiation illuminates a metallic surface, electrons are emitted”

Last Answer : Plank’s law

Description : Beta rays emitted by a radioactive material are – (1) The electrons orbiting around the nucleus (2) Charged particles emitted by nucleus (3) Neutral particles (4) Electromagnetic radiations

Last Answer : (2) Charged particles emitted by nucleus Explanation: A beta ray is a high-energy, highspeed electron (negatively charged) or positron (positively charged) emitted in the radioactive decay of an atomic nucleus, such as a potassium40 nucleus, in the process of beta decay.

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 : Beta rays emitted by a radioactive material are (1) The electrons orbiting around the nucleus (2) Charged particles emitted by nucleus (3) Neutral particles (4) Electromagnetic radiations

Last Answer : Charged particles emitted by nucleus

Description : The colour of the ocean appears blue because the sunlight falling on it is (a) Reflected (b) Refracted (c) Absorbed (d) Scattered

Last Answer : Ans:(d)

Description : The colour of the ocean appears to be blue because the sunlight falling on it is – (1) reflected (2) refracted (3) diffracted (4) scattered

Last Answer : (4) scattered Explanation: The reason the ocean is blue is due to the absorption and scattering of light. The blue wavelengths of light are scattered, similar to the scattering of blue light in the sky ... the red and weak in the blue, thus red light is absorbed quickly in the ocean leaving blue.

Description : ECE Board Exam March 1996 EIRP stands for _______________. A. effective isotropic refracted power B. effective and ideal radiated power C. effective isotropic reflected power D. effective isotropic radiated power

Last Answer : D. effective isotropic radiated power

Description : What factor determines whether a radio wave is reflected or refracted by the ionosphere?

Last Answer : Thickness of ionized layer.

Description : The colour of the ocean appears to be blue because the sunlight falling on it is (1) reflected (2) refracted (3) diffracted (4) scattered

Last Answer : scattered

Description : Skip distance can be maximized by using the ____ radiation angle possible and the ____ frequency that will be refracted at that angle. A. lowest, lowest B. lowest, highest C. highest, lowest D. highest, highest

Last Answer : B. lowest, highest

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 : A light ray traveling from glass into air strikes the glass-air surface at an angle 50 degrees to the normal. If the critical angle for the glass-air combination is 42 degrees, the percentage of light reflected from the surface is w) 6 x) 25 y) 38 z) 100

Last Answer : ANSWER: Z -- 100

Description : We can see non luminous object ,when the light a) emitted by the object falls on the eye . b) is reflected from the object towards eye . c) completely passes through the object . d) gets completely absorbed by object .

Last Answer : b) is reflected from the object towards eye .

Description : Pick up the correct statement from the following (A) 1 second of arc corresponds to a displacement ratio of 1:206, 300 (B) 1 degree of arc corresponds to a displacement ratio of 1:57 (C) ... to propagate themselves along a traverse as the square root of the number of stations (D) All the above

Last Answer : (D) All the above

Description : In Fraunhofer diffraction pattern for single slit, a central maximum is obtained when angle of diffraction q is equal to zero. What it actually indicates? A. All the diffracted rays are parallel and focused ... are diffracted by the slit in all the directions D. The rays are reflected by the slit

Last Answer : A. All the diffracted rays are parallel and focused by slit at a single point on screen

Description : A retaining wall 6m high supports a backfill with a surcharge angle of 10°. The back of the wall is inclined to the vertical at a positive batter angle of 5°. If the angle of wall friction is 7°, then the resultant ... inclined to the horizontal at an angle of (A) 7° (B) 10° (C) 12° (D) 17

Last Answer : (C) 12°

Description : The angle of internal friction of clays, is usually (A) 0° to 5° (B) 5° to 20° (C) 20° to 30° (D) 30° to 45

Last Answer : Answer: Option B

Description : The term critical angle describes ∙ A. the point at which light is refracted ∙ B. the point at which light becomes invisible ∙ C. the point at which light has gone from the refractive mode ... reflective mode ∙ D. the point at which light has crossed the boundary layers from one index to another

Last Answer : C. the point at which light has gone from the refractive mode to the reflective mode ∙

Description : Which of the following terms best describes the reason that light is refracted at different angles? ∙ A. Photon energy changes with wavelength ∙ B. Light is refracted as a function of surface smoothness ∙ ... determined partly by a and b ∙ D. The angle is determined by the index of the materials

Last Answer : ∙ D. The angle is determined by the index of the materials

Description : The termcritical angle describes a. the point at which light is refracted b. the point at which light becomes invisible c. the point at which light has gone from the refractive mode to the reflective mode d. the point at which light has crossed the boundary layers from one index to another

Last Answer : c. the point at which light has gone from the refractive mode to the reflective mode

Description : Reciprocating screens are normally inclined at an angle of 5° with the horizontal and employ gyratory motion at feed end & reciprocating motion at the discharge end. They are not suitable for the ... Dry chemicals (C) Heavy tonnages of rocks or gravel (D) Powdered food & granular materials

Last Answer : (C) Heavy tonnages of rocks or gravel

Description : Minimum radius of a simple circular curve deflecting through 5°, is (A) 1618.9 m (B) 1816.9 m (C) 1718.9 m (D) 1817.9 m

Last Answer : Answer: Option C

Description : Are there any angle parameters Under the Orthogonal Condition??

Last Answer : 90 degrees kiddo

Description : The maximum angle in which external light rays may strike the air/glass interface and still propagate down the fiber. ∙ A. Acceptance cone half-angle ∙ B. Acceptance cone ∙ C. Critical angle ∙ D. Angle of incidence

Last Answer : A. Acceptance cone half-angle

Description : The maximum angle in which external light rays may strike the air/glass interface and still propagate down the fiber.

Last Answer : Acceptance cone half-angle

Description : Mostly ________ is used in wireless LAN. a) time division multiplexing b) orthogonal frequency division multiplexing c) space division multiplexing d) channel division multiplexing

Last Answer : b) orthogonal frequency division multiplexing

Description : Through a point in a loaded soil mass, there exists typical planes mutually orthogonal on which the stress is wholly normal and no shear stress acts, if is (A) 1 (B) 2 (C) 3 (D) 4

Last Answer : Answer: Option C

Description : Pick out the wrong statement. (A) The ratio of the density of the 'nucleus' to that of the 'atom' is 10 12 (B) α-particle is identical with a doubly charged helium ion (C) The mass of deuterium atom is half that of helium atom (D) Gamma rays are high energy electrons

Last Answer : (D) Gamma rays are high energy electrons

Description : Assertion:- `ZN^(+2)` is more polarising than `Mg^(+2)`. Reason :- A pseudo inert gas configuration `Zn^(+2)` has high `Z_(eff)`, Then inert gas confi

Last Answer : Assertion:- `ZN^(+2)` is more polarising than `Mg^(+2)`. Reason :- A pseudo inert gas ... is False. D. If both Assertion & Reason are false

Description : Light rays that are emitted simultaneously from an LED and propagated down an optical fiber do not arrive at the far end of the fiber at the same time results to ∙ A. intramodal dispersion ∙ B. pulse length dispersion ∙ C. modal dispersion ∙ D. wavelength dispersion

Last Answer : D. wavelength dispersion

Description : LASER stands for: a. Light Amplification by Simulated Emission of Radiation b. Light Amplification by Stimulated Emission of Radiation c. Light Amplification by Simulated Emitted Rays d. Light Amplification by Stimulated Emitted Rays

Last Answer : b. Light Amplification by Stimulated Emission of Radiation

Description : The minimum energy required to eject an electron from a metal surface is called a) Intensity b) Threshold frequency c) Work function d) Photo energy

Last Answer : c) Work function