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An electron in a hydrogen atom is excited with electrical energy to an excited state with n = 2. The atom then

emits a photon.

What is the value of n for the electron following the emission?


An X-ray photon with a wavelength of 0.938 nm strikes a surface. The emitted electron has a kinetic energy of 982 eV

What is the binding energy of the electron in kJ/mol? [Note that KE

KE = 1/2 mv^2 and 1 electron volt (eV) = 1.602×10^-19 J.]

Express your answer using three significant figures.

The energy required to ionize boron is 801 kJ/mol

kJ/mol. What minimum frequency of light is required to ionize boron?

Express the minimum frequency in inverse seconds to three significant figures


1.8 in to mm

Express your answer using two significant figures.


110 . ft to cm

Express your answer using two significant figures.


1940 . kg to lb

Express your answer using two significant figures.


835 yd to km

Express your answer using two significant figures.


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