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# Physics unit 2 jan 2011

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1. 18 Ultraviolet radiation incident on a zinc plate releases electrons from the zinc’s surface.
The energy of each incident photon is 5.4 eV. Zinc has a work function of 4.3 eV.
(a) (i) State the name given to this effect.
(1)
................................ ................................ ................................ ................................ ................................ ................................ ................................ ................
(ii) State the speed of the photons.
(1)
................................ ................................ ................................ ................................ ................................ ................................ ................................ ................
(iii) What is meant by the work function of a metal?
(1)
................................ ................................ ................................ ................................ ................................ ................................ ................................ ................
................................ ................................ ................................ ................................ ................................ ................................ ................................ ................
................................ ................................ ................................ ................................ ................................ ................................ ................................ ................
(b) An electron is emitted from the surface of the zinc.
(i) Calculate the maximum kinetic energy of the electron in joules.
(3)
................................ ................................ ................................ ................................ ................................ ................................ ................................ ................
................................ ................................ ................................ ................................ ................................ ................................ ................................ ................
Maximum kinetic energy = ................................ ................................ ..............
(ii) Calculate the maximum speed of the electron.
(2)
................................ ................................ ................................ ................................ ................................ ................................ ................................ ................
................................ ................................ ................................ ................................ ................................ ................................ ................................ ................
Maximum speed = ................................ ................................ ..............

How do i do the last one have the others correct?
2. Sorry you've not had any responses about this. Are you sure you've posted in the right place? Here's a link to our subject forum which should help get you more responses if you post there.

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Just quoting in Puddles the Monkey so she can move the thread if needed
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