In an electron microscope, the electrons are accelerated by a voltage of 14 kV. If the voltage is changed to 224 kV, then the de Broglie wavelength associated with the electrons would _____.

The threshold wavelength for a metal surface whose photoelectric work function is 3.313 eV is _____.

The work function of a metal is hv₀. Light of frequency v falls on this metal. The photoelectric effect will take place only if ___________.

Photo electron effect supports quantum nature of light because ___________.

A charged oil drop is suspended in a uniform field of 3 x 10⁴ Vm^-1 so that it neither falls nor rises. The charge on the drop will be _____________.

Give the definition of intensity of light according to quantum concept and its unit.

A proton and an electron have same kinetic energy. Which one has greater de Broglie wavelength. Justify.

Write the relationship of de Broglie wavelength λ associated with a particle of mass m in terms of its kinetic energy K.

Define the term 'stopping potential' in relation to photoelectric effect.

Do all the electrons that absorb a photon come out as photoelectrons?

Explain experimentally observed facts of photoelectric effect with the help of Einstein’s explanation.

Briefly explain the principle and working of electron microscope.

Derive an expression for De Broglie wave length.

The figure shows a plot of three curves a, b, c showing the variation of photocurrent vs. Collector plate potential for three different intensities I₁, I₂, and I₃ having frequencies v₁, v₂ and v₃ respective incident on a photosensitive surface.
The figure shows a plot of three curves a, b, c showing the variation of photocurrent vs. Collector plate potential for three different intensities I₁, I₂, and I₃ having frequencies v₁,v_2, and v₃ respective incident on a photosensitive surface.

Red light however bright it is, cannot produce the emission of electrons from a clean zinc surface, but even weak ultraviolet radiation can do so; why?

What should be the velocity of the electron so that its momentum equals that of 4000 Å wavelength photon.

When a light of frequency 9 x 10¹⁴ Hz is incident on a metal surface, photoelectrons are emitted with a maximum speed of 8 x 10⁵ m/s. Determine the threshold frequency of the surface.

Write the application of x-rays.

When an electron in hydrogen atom jumps from the third excited state to the grand state, how would the de Broglie wavelength associated with the electron change? Justify your answer.