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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 33 times)

karen

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on: Jul 29, 2018
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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Reply #1 on: Jul 29, 2018
Answer to Question 1

E

Answer to Question 2

B


karen

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Reply 2 on: Jul 29, 2018
:D TYSM

ghepp

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Reply 3 on: Yesterday
Wow, this really help

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