Q: A hospital uses ultraviolet lamps to sterilize equipment. If the UV light has a wavelength of $$254\ \text{nm}$$, what is the frequency of this light? ($$c = 3.00 \times 10^8$\ \text{m/s})$$

$$1.18 \times 10$$^{15}$$\ \text{Hz}$$

Q: A neon sign emits red light with a wavelength of $$663.8\ \text{nm}. $$What is the energy of a single photon of this light? ($$h = 6.626 \times 10$$^{-34}$$\ \text{J}\cdot\text{s}$$, $$c = 3.00 \times 10^8$\ \text{m/s})$$

$$2.99 \times 10$$^{-19}$$\ \text{J}$$

Q: A metal surface has a work function (binding energy) of $$4.50 \times 10$$^{-19}$$\ \text{J}. If it is $$struck by photons with energy $$6.00 \times 10$$^{-19}$$\ \text{J}$$, what is the maximum kinetic energy of the emitted electrons?

$$1.50 \times 10$$^{-19}$$\ \text{J}$$

Q: A baseball (mass = $$0.150\ \text{kg}) is $$thrown at $$51.0\ \text{m/s}$$ with an uncertainty in velocity of $$0.12\%. $$According to the Heisenberg Uncertainty Principle, what is the minimum uncertainty in its position? ($$h = 6.626 \times 10$$^{-34}$$\ \text{J}\cdot\text{s})$$

$$7.2 \times 10$$^{-32}$$\ \text{m}$$

Q: What is the de Broglie wavelength of an electron (mass $$= 9.11 \times 10$$^{-31}$$\ \text{kg}) $$moving at $$2.00 \times 10^6$\ \text{m/s}$$? ($$h = 6.626 \times 10$$^{-34}$$\ \text{J}\cdot\text{s})$$

$$3.64 \times 10$$^{-10}$$\ \text{m}$$

Question 1

Which of the following statements best describes the relationship between wavelength ($$\lambda) $$and frequency ($$
u) $$for electromagnetic radiation traveling at the speed of light?

Accepted Answer

Wavelength and frequency are inversely proportional.

Question 2

A hospital uses ultraviolet lamps to sterilize equipment. If the UV light has a wavelength of $$254\ 	ext{nm}$$, what is the frequency of this light? ($$c = 3.00 	imes 10^8$\ 	ext{m/s})$$

Accepted Answer

$$1.18 	imes 10$$^{15}$$\ 	ext{Hz}$$

Question 3

Which of the following types of electromagnetic radiation has the highest energy per photon?

Accepted Answer

Gamma rays

Question 4

A neon sign emits red light with a wavelength of $$663.8\ 	ext{nm}. $$What is the energy of a single photon of this light? ($$h = 6.626 	imes 10$$^{-34}$$\ 	ext{J}\cdot	ext{s}$$, $$c = 3.00 	imes 10^8$\ 	ext{m/s})$$

Accepted Answer

$$2.99 	imes 10$$^{-19}$$\ 	ext{J}$$

Question 5

Which of the following transitions in a hydrogen atom would emit the shortest wavelength of light?

Accepted Answer

n = 3 to n = 1

Question 6

A metal surface has a work function (binding energy) of $$4.50 	imes 10$$^{-19}$$\ 	ext{J}. If it is $$struck by photons with energy $$6.00 	imes 10$$^{-19}$$\ 	ext{J}$$, what is the maximum kinetic energy of the emitted electrons?

Accepted Answer

$$1.50 	imes 10$$^{-19}$$\ 	ext{J}$$

Question 7

Which quantum number determines the shape of an atomic orbital?

Accepted Answer

Angular momentum quantum number ($$l)$$

Question 8

How many electrons can be accommodated in the $$4f$$ subshell?

Accepted Answer

14

Question 9

A baseball (mass = $$0.150\ 	ext{kg}) is $$thrown at $$51.0\ 	ext{m/s}$$ with an uncertainty in velocity of $$0.12\%. $$According to the Heisenberg Uncertainty Principle, what is the minimum uncertainty in its position? ($$h = 6.626 	imes 10$$^{-34}$$\ 	ext{J}\cdot	ext{s})$$

Accepted Answer

$$7.2 	imes 10$$^{-32}$$\ 	ext{m}$$

Question 10

Which of the following sets of quantum numbers is NOT possible for an electron?

Accepted Answer

$$n = 4,\ l = 3,\ m_l = 4,\ m_s = +1/2$$

Question 11

What is the de Broglie wavelength of an electron (mass $$= 9.11 	imes 10$$^{-31}$$\ 	ext{kg}) $$moving at $$2.00 	imes 10^6$\ 	ext{m/s}$$? ($$h = 6.626 	imes 10$$^{-34}$$\ 	ext{J}\cdot	ext{s})$$

Accepted Answer

$$3.64 	imes 10$$^{-10}$$\ 	ext{m}$$

Question 12

Which of the following statements about the electromagnetic spectrum is correct?

Accepted Answer

As you move from radio waves to gamma rays, wavelength decreases and frequency increases.

Question 13

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

Accepted Answer

5

Question 14

Which of the following atomic orbitals has the greatest number of radial nodes?

Accepted Answer

6d

Question 15

A photon has a wavelength of $$835\ \mu	ext{m}$$ and contains $$6.32 	imes 10$$^{-3}$$\ 	ext{J} of $$energy. How many photons are present?

Accepted Answer

$$2.12 	imes 10$$^{19}$$

Question 16

Which quantum number is associated with the orientation of an orbital in space?

Accepted Answer

Magnetic quantum number ($$m_l)$$

Question 17

Which of the following transitions represents absorption with the greatest frequency in a hydrogen atom?

Accepted Answer

n = 1 to n = 3

Question 18

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

Accepted Answer

98

Quantum Mechanics in General Chemistry: Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards