Q: A photon with a wavelength of 320 nm strikes a metal surface and emits an electron with a kinetic energy of $$3.30 \times 10$$^{-19}$$ J. What is the binding energy of the electron in kJ/mol? (1$ electron volt (eV) = 1.602$$ \times $$10^{-19} J$$, $$N_A = 6.022 \times 10$$^{23}$$ mol$$^{-1}$$)

$$5.62 \times 10$$^{2}$$ kJ/mol

Question 1

Which of the following electromagnetic waves has the highest frequency?

Accepted Answer

Wave (317 nm)

Question 2

Calculate the frequency (in Hz) of red light emitted by a neon sign with a wavelength of 663.3 nm. Use $$c = 3.00 	imes 10^8$ m/s.

Accepted Answer

$$4.52 	imes 10$$^{14}$$ Hz

Question 3

A mercury lamp emits photons with a frequency of $$6.88 	imes 10$$^{14}$$ Hz. What is the energy (in J) of one photon? Use h = 6.626$$ 	imes $$10^{-34} J$$·s.

Accepted Answer

$$4.56 	imes 10$$^{-19}$$ J

Question 4

Which type of electromagnetic radiation carries the greatest amount of energy per photon?

Accepted Answer

X-Ray

Question 5

A photon with a wavelength of 320 nm strikes a metal surface and emits an electron with a kinetic energy of $$3.30 	imes 10$$^{-19}$$ J. What is the binding energy of the electron in kJ/mol? (1$ electron volt (eV) = 1.602$$ 	imes $$10^{-19} J$$, $$N_A = 6.022 	imes 10$$^{23}$$ mol$$^{-1}$$)

Accepted Answer

$$5.62 	imes 10$$^{2}$$ kJ/mol

Question 6

What is the wavelength (in meters) of a proton moving at $$4.25 	imes 10^5$ m/s? (Mass of a proton = 1.67$$ 	imes $$10^{-27} kg$$, $$h = 6.626 	imes 10$$^{-34}$$ J·s)

Accepted Answer

$$9.34 	imes 10$$^{-10}$$ m

Question 7

According to the Heisenberg Uncertainty Principle, if the uncertainty in position ($$\Delta x) of a $$neutron is 712 pm, what is the minimum uncertainty in its velocity ($$\Delta v$$)? (Mass of neutron = $$1.675 	imes 10$$^{-27}$$ kg, h = 6.626$$ 	imes $$10^{-34} J$$·s)

Accepted Answer

$$6.95 	imes 10^2$ m/s

Question 8

Which electron transition in a hydrogen atom represents emission of the shortest wavelength?

Accepted Answer

$$n=4 \rightarrow n=1$$

Question 9

Which of the following is a possible value for a principal quantum number ($$n$$)?

Accepted Answer

$$n=1$$

Question 10

How many different values of $$m_l$$ are possible for a 4d set of orbitals?

Accepted Answer

5

Question 11

Which of the following sets of quantum numbers is possible for an electron in a 5d orbital?

Accepted Answer

$$n=5, l=2, m_l=0, m_s=+1/2$$

Question 12

How many radial nodes are present in a 4d orbital?

Accepted Answer

2

Question 13

What is the energy (in Joules) of a photon released during a transition from $$n=4 to$$ $$n=1$$ state in the hydrogen atom? ($$R_H = 2.18 	imes 10$$^{-18}$$ J)

Accepted Answer

$$2.04 	imes 10$$^{-18}$$ J

Question 14

Which quantum number gives information about the shape of the orbital?

Accepted Answer

Angular momentum quantum number ($$l)$$

Question 15

How many electrons can be found in the 7f shell of an atom?

Accepted Answer

14

Question 16

Which of the following statements is FALSE?

Accepted Answer

The second shell of an atom possesses d orbitals.

Question 17

If the uncertainty in velocity of a proton is $$1.77 	imes 10^5$ m/s, what is the uncertainty in its position? (Mass of proton = 1.67$$ 	imes $$10^{-27} kg$$, $$h = 6.626 	imes 10$$^{-34}$$ J·s)

Accepted Answer

$$2.82 	imes 10$$^{-9}$$ m

Question 18

Which electron emission corresponds to the Balmer series of lines in the spectrum of a hydrogen atom?

Accepted Answer

$$n=3 \rightarrow n=2$$

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