What is de-Broglie hypothesis? Obtain the relation for de-Broglie wavelength.

The photoelectric work function for a metal surface is \(2.3 eV\). If the light of wavelength 6800Å is incident on the surface of metal, find threshold frequency and incident frequency. Will there be an emission of photoelectrons or not? [Velocity of light \(c=3 \times 10^8 m / s\), Planck's constant, \(h=6.63 \times 10^{-34} Js\) ]

Describe an experiment for the study of characteristics of photoelectric effect.

The photoelectric threshold wavelength of a metal is \(230 nm\). Determine the maximum kinetic energy in joule and in \(eV\) of the ejected electron for the metal surface when it is exposed to a radiation of wavelength \(180 nm\), [Planck's constant : \(h=6.63 \times 10^{-34} Js\), Velocity of light : \(c=3 \times 10^8 m / s\).]

Draw a well labelled diagram of photoelectric cell. Explain the observations made by Hertz and Lenard about the phenomenon of photoelectric emission.

The photoelectric current in a photoelectric cell can be reduced to zero by a stopping potential of 1.8 volt. Monochromatic light of wavelength 2200Å is incident on the cathode. Find the maximum kinetic energy of the photoelectrons in joules. [Charge on electron \(=1.6 \times 10^{-19} C\)]

With neat labelled circuit diagram, describe an experiment to study the characteristics of photoelectric effect.

State Einstein's photoelectric equation. Explain any two characteristics of photoelectric effect on the basis of this equation.

What is photoelectric effect? Define: (i) Stopping potential, (ii) Photoelectric work function.

Light of wavelength 3000Å falls on a metal surface having work function \(2.3 eV\). Calculate the maximum velocity of ejected electrons. (Planck's constant \(h=6.63 \times 10^{34}\) J.s., Velocity of light \(c=3 \times 10^8 m / s\), Mass of an electron \(=9.1 \times 10^{-31} kg\) )