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Author Question: When light of wavelength 350 nm is incident on a metal surface, the stopping potential of the ... (Read 58 times)

CharlieWard

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on: Jul 29, 2018
When light of wavelength 350 nm is incident on a metal surface, the stopping potential of the photoelectrons is measured to be 0.500 V.
 
  What is the work function of this metal? (c = 3.00  108 m/s, h = 6.626  10-34 J  s, 1 eV = 1.60  10-19 J)
  A) 3.05 eV B) 4.12 eV C) 0.500 eV D) 3.54 eV

Question 2

A jogger is running outdoors on a cold day when the temperature is -20.0C. She is breathing at the rate of 25 breaths per minute, and each time she breathes in she inhales 0.00450 m3 of air.
 
  How much heat does she lose from breathing during 20.0 minutes of jogging if the air in her lungs is heated to her body temperature of 37.0C before it is exhaled? The specific heat of air is 1020 J/kg  K and the density of air under typical conditions is 1.29 kg/m3.
  A) 169 kJ
  B) 278 kJ
  C) 354 kJ
  D) 431 kJ
  E) 543 kJ
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aidanmbrowne

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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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CharlieWard

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Reply 2 on: Jul 29, 2018
Gracias!

vickyvicksss

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Reply 3 on: Yesterday
Excellent

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