What is the energy of a photon that has a wavelength equal to the ...

[ishan]

What is the energy of a photon that has a wavelength equal to the de Broglie wavelength of a proton having a speed of 7.1  104 m/s? (mproton = 1.67  10-27 kg, c = 3.00  108 m/s)
 
  A) 220 keV
  B) 150 keV
  C) 290 keV
  D) 360 keV
  E) 440 keV

Question 2

A 25-L container holds ideal hydrogen (H2 ) gas at a gauge pressure of 0.25 atm and a temperature of 0C. What mass of hydrogen gas is in this container?
 
  The ATOMIC mass of hydrogen is 1.0 g/mol, the ideal gas constant is R = 8.314 J/molK = 0.0821 L  atm/mol  K, and 1.00 atm = 101 kPa.
  A) 2.8 g B) 1.4 g C) 4.2 g D) 6.3 g E) 5.6 g

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Answer to Question 1

A

Answer to Question 2

A

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