Author Question: If the work function of a metal surface is 2.20 eV, what frequency of incident light would give a ... (Read 135 times)

sc00by25 · **on:** Jul 29, 2018

If the work function of a metal surface is 2.20 eV, what frequency of incident light would give a maximum kinetic energy of 0.25 eV to the photoelectrons ejected from this surface? (1 eV = 1.60 10-19 J, h = 6.626 10-34 J s)

A) 2.50 1014 Hz
B) 3.53 1014 Hz
C) 5.92 1014 Hz
D) 2.05 1014 Hz
E) 1.02 1014 Hz

Question 2

A 6.0-F air-filled capacitor is connected across a 100-V potential source (a battery). After the battery fully charges the capacitor, it is left connected and the capacitor is immersed in transformer oil, which has a dielectric constant of 4.5.

How much additional charge flows from the battery onto the capacitor during this process?
A) 1.2 mC B) 2.1 mC C) 2.5 mC D) 1.7 mC

ecox1012 · **Reply #1 on:** Jul 29, 2018

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