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Author Question: If the de Broglie wavelength of an electron is 380 nm, what is the speed of this electron? ... (Read 94 times)

Yi-Chen

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on: Jul 29, 2018
If the de Broglie wavelength of an electron is 380 nm, what is the speed of this electron? (melectron = 9.11  10-31 kg, h = 6.626  10-34 J  s)
 
  A) 2.0 km/s
  B) 3.8 km/s
  C) 1.9 km/s
  D) 4.1 km/s
  E) 5.2 km/s

Question 2

An object is placed 60 cm from a convex lens with a focal length of magnitude 10 cm. What is the magnification?
 
  A) -0.10
  B) 0.10
  C) 0.15
  D) 0.20
  E) -0.20
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kardosa007

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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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Yi-Chen

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Reply 2 on: Jul 29, 2018
Wow, this really help

alvinum

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Reply 3 on: Yesterday
Excellent

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