The photo-electric effect occurs only when the incident light has more than a certain critical

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The photo-electric effect occurs only when the incident light has more than a certain critical frequency 

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In order for fiber optics to work, the incident light inside the fiber must hit the wall of the fiber at: w) 90 degrees x) 45 degrees y) an angle greater than the critical angle z) none of the above

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Last Answer : ANSWER: Y -- AN ANGLE GREATER THAN THE CRITICAL ANGLE 

The emission of number of photo electrons depends upon a) The colour of the body b) The frequency of incident light c) The intensity of light d) All of the above

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Description : Photo electric effect supports the quantum nature of light because:

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At transition temperature the value of critical field is?

Description : At transition temperature the value of the critical field is?

Last Answer : At transition temperature the value of critical field is zero.

In a superconductor the value of critical density depends upon?

Description : In a superconductor the value of critical density depends upon?

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The value of critical field below the transition temperature will?

Description : The value of critical field below the transition temperature will?

Last Answer : The value of critical field below the transition temperature will increase.

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

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The phenomena of pair production occurs only when the energy of incident photon is least equal a) 10.2 MeV b) 1.02 MeV c) 1.02 eV d) 0.102 MeV

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Thermionic emission occurs in?

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Photo electric effect was propounded by?

Description : Photo electric effect was propounded by?

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The process of putting a number of pictures and combining it as one for a total effect is known as: a) Photo Montageb) Electric Montage c) Rhythmic Montage d) None of these

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The process of putting a number of pictures and combining it as one for a total effect is known as: a) Photo Montage b) Electric Montage c) Rhythmic Montage d) None of these

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The reverse process of photo-electric effect is called: a) Annihilation of matter b) Compton effect c) Pair production d) X-rays

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A device based on photo electric effect is called a) Photo sensitive b) Photo diode c) Photo synthesis d) Photo cell

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When a beam of light travels through media of two different densities, if theangle of incidence isgreater than the critical angle, _______ occurs. A) reflection B) refraction C) incidence D) criticism

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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

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The transmission coefficient of a wave with incident and transmitted electric field of 5 and 5 respectively is a) 0 b) 1 c) 10 d) 5

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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

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Last Answer : b) 0.4

A light ray incident on the optical fiber core is propagated along the fiber. Is the angle of incidence of the light ray entering the fiber larger or smaller than the acceptance angle

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.A beam of light is incident on a large block of glass. The index of refraction of the glass is greater than one. Is the wavelength of the light in the glass? A. Longer than B. Shorter than C. The same as the wavelength of the light in the air? D. None of above

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A beam of light is incident on a large block of glass. The index of refraction of the glass is greater than one. Is the wavelength of the light in the glass: w) longer than x) shorter than y) the same as the wavelength of the light in the air?

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A beam of light is incident on a perfectly smooth body of water. The angle that the REFLECTED ray makes with the normal is: w) greater than x) smaller than y) the same as the angle the incident ray makes with the normal.

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4. If a light ray IM is incident on the surface AB as shown, identify the correct emergent ray. [Delhi (C)] -Chemistry-10

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Last Answer : Answer. Ray NQ, as it has to be parallel to ray OS.

If a light ray IM is incident on the surface AB as shown, identify the correct emergent ray. light-reflection-and-refraction-chapter-wise-important-questions-class-10-science-8 -Physics

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Last Answer : Ray NQ, as it has to be parallel to ray OS.

A light ray is incident on a plane mirror placed in a horizontal plane, making an angle of `30^(@)` with the vertical, then the angle between the refl

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A ray of light incident at `49^(@)` on the face of an equilaternal prism passes symmetrically. Calculate the refractive index of the material of the p

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A ray of light is incident at an angle of `60^(@)` on one face of a prism of angle `30^(@)`. The ray emerging out of the prism makes an angle of `30^(

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Monochromatic radiation of wavelength `lambda` is incident on a hydrogen sample in ground state. hydrogen atoms absorb a fraction of light and subsequ

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When light is incident on a black body it is?

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When light is incident on a black body?

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The refractive index of the material of a glass prism depends upon (a) The angle of the prism (b) The intensity of the incident light ray (c) The colour of the incident light ray (d) Size of the prism

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Diamonds are glittering and attractive because light incident on them undergoes – (1) highest refraction (2) multiple internal reflections (3) multiple surface reflections (4) hundred percent transmission

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A light wave is incident over a plane surface with velocity x. After reflection the velocity becomes- (1) x/2 (2) x (3) 2x (4) x/4

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Last Answer : (2) x Explanation: When a ray of light incident on a boundary separating two media comes back into the same media, this phenomenon, is called reflection of light. After reflection velocity, wavelength and frequency of light remains same but intensity decreases.

If a mirror is used to reflect light, the reflected light angle is ____ as the incident angle a. Smaller b. Larger c. The same d. Independent

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Last Answer : c. The same

What do you call the reflection of a part of incident light at the interface of two media that have different refractive indices? A. Snell’s reflection B. Fresnel reflection C. Lambertian reflection D. Huygen’s reflection

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Last Answer : B. Fresnel reflection

Find the band gap energy when a light of wavelength 1240nm is incident on it. a) 1eV b) 2eV c) 3eV d) 4eV

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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

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Last Answer : ∙ B. a light directed toward a surface

If a mirror is used to reflect light, the reflected light angle is ____ as the incident angle ∙ a. Smaller ∙ b. Larger ∙ c. The same ∙ d. Independent

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Last Answer : c. The same

The gingival portion of natural teeth differs in colour from the incisal portion because the : A. Lighting angle is different B. Gingival and incisal portions have different fluorescent qualities C. Gingival area has a dentine background D. Incident light is different

Description : The gingival portion of natural teeth differs in colour from the incisal portion because the : A. Lighting angle is different B. Gingival and incisal portions have different fluorescent qualities C. Gingival area has a dentine background D. Incident light is different

Last Answer : C. Gingival area has a dentine background

In human flesh, the three light elements which predominate, and allow greater amount of incident X-rays to pass through them are a) oxygen, nitrogen , hydrogen b) oxygen, hydrogen, helium c) oxygen, hydrogen, carbon d) carbon, nitrogen, oxygen

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Last Answer : c) oxygen, hydrogen, carbon

Why in Newton’s rings setup, the beam splitter (mirror) is kept at 450? (a) It allows light rays to incident at 450over the top surface of Plano convex lens (b) It allows light rays to incident uniformly over the top surface of Plano convex lens (c) It allows light rays to incident parallel over the top surface of Plano convex lens (d) It allows light rays to incident at 900over the top surface of Plano convex lens

Description : Why in Newton's rings setup, the beam splitter (mirror) is kept at 450? (a) It allows light rays to incident at 450over the top surface of Plano convex lens (b) It allows light rays to ... Plano convex lens (d) It allows light rays to incident at 900over the top surface of Plano convex lens

Last Answer : (d) It allows light rays to incident at 900over the top surface of Plano convex lens