Physics - Mock Test 28

Question 271

If a diffraction grating is placed in the path of a light beam it reveals?

A) Wave property B) Particle property C) Energy particle D) Electromagnetic wave property

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Question 272

In Davisson-Germer experiment the diffracted proton from crystal shows?

A) Particle property B) Wave property C) Light property D) Quantum property

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Question 273

If the wavelength of incident radiation is increased in photoemission then?

A) The maximum kinetic energy of the photoelectrons increases. B) The minimum kinetic energy of the photoelectrons decreases. C) The minimum kinetic energy of the photoelectrons increases. D) The average kinetic energy of the photoelectrons decreases

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Question 274

After traveling through a vacuum a photon of light entering into some transparent denser medium. Thus the energy of light?

A) Increases because wavelength decreases B) Decreases because speed decreases C) Remains same D) Increases then decreases

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Question 275

A photon is?

A) a unit of energy B) a positively charged particle C) a quantum of electromagnetic radiation D) a unit of wavelength

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Question 276

Davison Germer experiment indicates?

A) interference B) polarization C) election diffraction D) refraction

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Question 277

Einsteins photoelectric equation is given by?

A) 1/2 mvmax2=hf+? B) 1/2 mvmax2-hf = ? C) 1/2 mvmax2=hf-? D) all of above are correct

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Question 278

Rest mass of a photon is?

A) infinite B) zero C) very small D) 1.67 x 10-27 kg

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Question 279

As the temperature of black body is raised the wavelength corresponding to maximum intensity?

A) shifts towards longer wavelength B) shifts towards shorter wavelength C) remain the same D) shifts towards longer as well as shorter wavelengths

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Question 280

If a material object moves with speed of light its mass becomes?

A) equal to its rest mass B) double of its rest mass C) infinite D) zero

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