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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?

n=


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

BEmol=______kj/mol


1.8 in to mm

Express your answer using two significant figures.


L1=______mm



110 . ft to cm

Express your answer using two significant figures.


L2=______mm


1940 . kg to lb

Express your answer using two significant figures.


m=______lb


835 yd to km

Express your answer using two significant figures.


L3=_____km

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