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Author Question: A certain crystal has an interatomic spacing of 0.142 nm. If a beam of electrons moving with a speed ... (Read 90 times)

karen

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A certain crystal has an interatomic spacing of 0.142 nm. If a beam of electrons moving with a speed of 1400 m/s is diffracted from this crystal, what is the de Broglie wavelength of the electron?
 
  A) 420 nm
  B) 130 nm
  C) 260 nm
  D) 502 nm
  E) 520 nm

Question 2

The length of a certain wire is doubled and at the same time its radius is tripled. What is the change in the resistance of this wire?
 
  A) It stays the same.
  B) It is reduced by a factor of 4.5.
  C) It is doubled.
  D) It is tripled.
  E) It is quadrupled.



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cupcake16

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Answer to Question 1

E

Answer to Question 2

B




karen

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Reply 2 on: Jul 29, 2018
:D TYSM


isabelt_18

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Reply 3 on: Yesterday
Wow, this really help

 

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