*plese * *will be awarded brainliest answer*
pes experiments frequently use an x-ray wavelength of 0.8340 nm. recall that the energy of a photon can be calculated using the equation e=hclλ.
a. calculate the energy of the x-ray photon used in the pes experiment described.
b. calculate the ionization energy of a photoelectron with a kinetic energy of 2.372*10^-16j.

Explanation:

Use the trigonometric ratio definition of the tangent function and the quotient rule.

Quotient rule: the derivative of a quotient is:

So,

                                   = [ cos(x)cos(x) + sin(x) sin(x) ] / [ cos(x)]²

                                   = [ cos²(x) + sin²(x) ] / cos²(x)

                                   = 1 / cos² (x)

                                   = sec² (x)

The result is that the derivative of tan(x) is sec² (x)

answer : third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

explanation :

let us write down the given equations

equation 1 :

equation 2 :

equation 3 :

let us use hess's law to find out which 2 equations can be added to get the third equation.

let us reverse equation 2 and multiply it by 2. the new equation that we get is,

equation 4 :

let us add equation 1 & 4

the above equation is similar to equation 3 but has different value for dhrxn.

therefore third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol