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Author Question: A photocathode whose work function is 2.9 eV is illuminated with white light that has a continuous ... (Read 68 times)

ETearle

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on: Jul 29, 2018
A photocathode whose work function is 2.9 eV is illuminated with white light that has a continuous wavelength band from 400 nm to 700 nm.
 
  What is the range of the wavelength band in this white light illumination for which photoelectrons are not produced?(c = 3.00  108 m/s, h = 6.626  10-34 J  s, 1 eV = 1.60  10-19 J) A) 430 nm to 700 nm
  B) 400 nm to 480 nm
  C) 430 nm to 480 nm
  D) 400 nm to 430 nm
  E) 480 nm to 700 nm

Question 2

A machine part consists of 0.10 kg of iron (of specific heat 470 J/kg  K ) and 0.16 kg of copper (of specific heat 390 J/kg  K). How much heat must be added to the gear to raise its temperature from 18C to 53C?
 
  A) 3800 J B) 4400 J C) 4000 J D) 910 J
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Silverbeard98

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Reply #1 on: Jul 29, 2018
Lorsum iprem. Lorsus sur ipci. Lorsem sur iprem. Lorsum sur ipdi, lorsem sur ipci. Lorsum sur iprium, valum sur ipci et, vala sur ipci. Lorsem sur ipci, lorsa sur iprem. Valus sur ipdi. Lorsus sur iprium nunc, valem sur iprium. Valem sur ipdi. Lorsa sur iprium. Lorsum sur iprium. Valem sur ipdi. Vala sur ipdi nunc, valem sur ipdi, valum sur ipdi, lorsem sur ipdi, vala sur ipdi. Valem sur iprem nunc, lorsa sur iprium. Valum sur ipdi et, lorsus sur ipci. Valem sur iprem. Valem sur ipci. Lorsa sur iprium. Lorsem sur ipci, valus sur iprem. Lorsem sur iprem nunc, valus sur iprium.
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ETearle

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Reply 2 on: Jul 29, 2018
Great answer, keep it coming :)

kjohnson

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Reply 3 on: Yesterday
Wow, this really help

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