The Photoelectric effect

In the photo electric effect ---------------- fell onto a polished metal surface.

• electrons
• photons
• waves
• plutons

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This caused ------------------ to be emitted by the surface

• electrons
• photons
• waves
• plutons

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The energy of the emitted electrons was measured using a -----------------

• standing voltage
• striking voltage
• stopping voltage
• starting voltage

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To release an electron the energy of the photon had to be more than

• zero
• the cut off frequency
• the work function
• the cut off wavelength

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the energy of the photon is ---------------

• hf
• h/f
• hf + Φ
• hf - Φ

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The energy of the emitted electron is ------------

• hf
• h/f
• hf + Φ
• hf - Φ

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The energy of the emitted photon can also be worked out from the stopping voltage -----------

• V
• eV
• eV - Φ
• eV + Φ

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The equation for the photoelectric effect is 
eV = hf - Φ
The graph of electron energy against frequency is

• a straight line through the origin
•  a straight line gradient h
• a straight line with a positive y intercept
• not a straight line

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The cut off frequency is 

• the highest frequency that releases electrons
• always in the red part of the spectrum
• always in the purple part of the spectrum
• different for different metals

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the wavelength of a photon can be found using 

• λ = cf
• λ = hf
• λ = c/f
• λ = f/c

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