Which of the following contributes to the problem of ...

[fagboi]

Which of the following contributes to the problem of greenhouse-effect heating of the atmosphere?
 
  A) Coal-burning power plants
  B) Gasoline-fueled automobile engines
  C) Both of the above.
  D) Nuclear power plants
  E) All of the above.

Question 2

A nonrelativistic electron is accelerated from rest through a potential difference. After acceleration the electron has a de Broglie wavelength of 880 nm. What is the potential difference through which this electron was accelerated?
 
  (h = 6.626  10-34 J  s, e = 1.60  10-19 C, mel = 9.11  10-31 kg)
  A) 1.9 V
  B) 1.7 V
  C) 2.2 V
  D) 2.5 V

[jaygar71]

Answer to Question 1

C

Answer to Question 2

A

[fagboi]

Thank you!

[jaygar71]

Always glad to help...