Explanation:
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Answer:
a) Platinum > Beryllium > Aluminum > Magnesium > Potassium > Cesium
b) Cesium > Potassium > Magnesium > Aluminum > Beryllium > Platinum
c) Cesium > Potassium
Explanation:
We must recall that the frequency of an electromagnetic wave is directly proportional to its energy. Hence as the work function of the metal increases, the minimum frequency required for emission of electrons occur increases accordingly.
Similarly, the maximum wavelength required for electron emission to occur varies inversely as the work function of the metal hence the answer provided.
Lastly, only caesium and potassium has work function less than the energy of the incident photon hence only these two metals experience electron emission with the kinetic energy of electrons emitted from caesium greater than that emitted from potassium.
Answer:
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Explanation:
Molarity is defined as the number of moles of solute dissolved in 1 L of solution
the molarity of the solution to be prepared is 7.65 M
the volume to be prepared of CaBr₂ is 4.65 L
the number of CaBr₂ moles are - 7.65 mol/L x 4.65 L = 35.6 mol
the molar mass of CaBr₂ - 200 g/mol
mass of 35.6 mol - 35.6 mol x 200 g/mol = 7120 g
mass required of CaBr₂ to make the solution is 7120 g