A photon in light beam A has twice the energy of one in light beam B. The ratio of ï¬ A / ï¬ B of the wavelengths

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# A photon in light beam A has twice the energy of one in light beam B. The ratio of ï¬ A / ï¬ B of the wavelengths - PowerPoint PPT Presentation

0 of 250. 30. A photon in light beam A has twice the energy of one in light beam B. The ratio of  A /  B of the wavelengths is:. 1/2 1/4 1 2 4.

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Presentation Transcript

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30

A photon in light beam A has twice the energy of one in light beam B. The ratio of A / B of the wavelengths is:
• 1/2
• 1/4
• 1
• 2
• 4

Monoenergetic electrons are incident on a single slit barrier. If the energy of each incident electron is increased the central maximum of the diffraction pattern:

• widens
• narrows
• Stays the same
• Depends on the speed of the electrons

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Light beams A and B have the same intensity but A is longer than B. The photon flux (number crossing a unit area per unit time) is:
• Greater for A than for B
• Greater than B than for A
• The same for A and B
• Not enough info to decide