DUAL NATURE OF RADIATION AND MATTER

Photoelectric effect phenomenon was discovered by:

• Newton

• Maxwell

• Hertz

• Huygens

Hallwachs experiment set-up is used to study:

• Tyndal effect

• Diffraction of light

• Photo electric effect

• Raman effect

Photoelectric current is ………. proportional to the number of photoelectrons emitted per second.

• inversely

• directly

• first directly and then inversely

• none of these

The stopping potential depends upon the ....……….. of the fastest electron.

• velocity

• charge

• mass

• density

For a given frequency of the incident radiation, the stopping potential …..…….... of its intensity.

• is directly proportional

• is inversely proportional

• is independent

• None of these

Photoelectric emission is a/an …………………. process.

• slow

• fast

• instantaneous

• very slow

The maximum kinetic energy of the photoelectrons is ….......... proportional to the frequency of incident radiation.

• inversely

• directly

• first directly and then inversely

• none of these

According to the quantum theory, light is emitted in the form discrete bundles of energy called ……………..

• waves

• corpuscles

• photons

• mesons

The energy spent in releasing the photoelectrons from a metal surface is called ……………

• kinetic energy

• potential energy

• work function

• excitation energy

A photon of frequency ν is incident on a metal surface of threshold frequency νο. The kinetic energy of the emitted photoelectron is:

• h (𝜈– 𝜈_ο )

• h𝜈

• h𝜈_ο

• h (𝜈 + 𝜈_ο )