photoelectric effect 1

The only way to increase the number of photoelectrons emitted is by increasing the _________ of the light

• Intensity

• Wavelength

• Frequency

• Energy

The energy of photoelectrons emitted from a metal surface can be increased by

• using light of higher frequency.

• using light of longer wavelength.

• using light of higher intensity.

• using monochromatic, polarized light.

The photoelectric effect only occurs if the light shining on the metal is:

• coherent.
• above a minimum intensity.
• above a minimum frequency.
• above a minimum wavelength.

Does high-frequency or low frequency light cause the ejection of a greater number of electrons from a metal surface?

• only high frequency
• only low frequency
• both of them
• doesn't depend to frequency

What is the best description of 'threshold frequency'?

• The minimum energy needed for electrons to escape a surface.

• The maximum kinetic energy that an emitted electron has.

• The minimum frequency of a photon that will cause an electron to be emitted.

• The frequency that an emitted electron will have.

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

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

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

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

• hf
• h/f
• hf + Φ
• hf - Φ

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

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