Dual Nature of ...

U. V. light of wavelength 200 mm is incident on polished surface of Fe. work function of the surface is 4.5 eV. Find maximum speed of photo electrons.
(h = 6.625 × 10^–34 J.s, c = 3 × 10⁸ ms^–1. 1 eV = 1.6 × 10^–19)

Light of 4560 Å 1 mW is incident on photo-sensitive surface of Cs (Cesium). If the quantum efficiency of the surface is 0.5% what is the amount of photoelectric current produced ?

Work function of metal is 2 eV. Light of intensity 10^–5 Wm^–2 is incident on 2 cm² area of it. If 10¹⁷ electrons of these metals absorb the light, in how much time does the photo electric effect start ? Consider the waveform of incident light

Radius of a beam of radiation of wavelength 5000 Å is 10^–3 m . Power of the beam is 10^–3 W . This beam is normally incident on a metal of work function 1.9 eV. The charge emitted by the metal per unit area in unit time is...............Assume that each incident photon emits one electron.
(h = 6.625 × 10^–34 J.s)

11 × 10¹¹ Photons are incident on a surface in 10 s. These photons correspond to a wavelength of 10 Å . If the surface area of the given surface is 0.01 m², the intensity of given radiations is...........
(h = 6.625 × 10^–34 J.s)

If alpha particle and neutron move with velocity v and 2v, the ratio of their de-Brogle wavelength will be.....................

Uncertainty in position of electron is found of the order of de-Broglie wavelength. Using Heisenberg\'s uncertainty principle, it is found that order of uncertainty in its velocity = ............

Frequency of incident light on body is f. Threshold frequency of body is f₀ . Maximum velocity of electron = ..................where m is mass of electron.

If electron is accelerated under 50 KV in microscope, find its de-Broglie wavelength.

Energy of photon having wavelength is 2 eV. Maximum velocity of emitted photo electron after incidence of photon is v. If value of is decreased by 25% and maximum velocity is made double, work function metal will be.................eV