Q: Which of the following is the correct order of electromagnetic radiation in increasing frequency?

Radio waves < Infrared < Ultraviolet < Gamma rays

Question 1

Which equation correctly relates the speed of light $c$, wavelength $\lambda$, and frequency $
u$ of electromagnetic radiation?

Accepted Answer

$c = \lambda 
u$

Question 2

A laser emits light with a wavelength of 532 nm. What is the frequency of this light? (Speed of light $c = 3.00 	imes 10^8$ m/s)

Accepted Answer

$5.64 	imes 10^{14}$ Hz

Question 3

Which type of electromagnetic radiation has the highest energy per photon?

Accepted Answer

Gamma rays

Question 4

Calculate the energy of a photon with a frequency of $1.00 	imes 10^{15}$ Hz. (Planck's constant $h = 6.626 	imes 10^{-34}$ J·s)

Accepted Answer

$6.63 	imes 10^{-19}$ J

Question 5

Which statement best describes the Bohr model of the atom?

Accepted Answer

Electrons orbit the nucleus in defined energy levels and can absorb or emit energy when moving between levels.

Question 6

An electron in a hydrogen atom transitions from $n=4$ to $n=2$. Which equation gives the energy change for this transition?

Accepted Answer

$\Delta E = -R_H \left( \frac{1}{2^2} - \frac{1}{4^2} \right)$

Question 7

Which quantum number determines the shape of an orbital?

Accepted Answer

Azimuthal quantum number $l$

Question 8

What is the maximum number of electrons that can occupy the $3p$ subshell?

Accepted Answer

6

Question 9

Which of the following sets of quantum numbers is NOT allowed for an electron in an atom?

Accepted Answer

$n=2, l=2, m_l=0, m_s=+\frac{1}{2}$

Question 10

A photon has a wavelength of 150 nm. What is its energy? ($h = 6.626 	imes 10^{-34}$ J·s, $c = 3.00 	imes 10^8$ m/s)

Accepted Answer

$1.33 	imes 10^{-18}$ J

Question 11

Which electron configuration is correct for carbon (atomic number 6)?

Accepted Answer

1s$^2$ 2s$^2$ 2p$^2$

Question 12

Which principle states that no two electrons in an atom can have the same set of four quantum numbers?

Accepted Answer

Pauli Exclusion Principle

Question 13

What is the uncertainty in position ($\Delta x$) of an electron traveling at $1.35 	imes 10^6$ m/s with an uncertainty in velocity ($\Delta v$) of $1.18 	imes 10^3$ m/s? ($m_e = 9.11 	imes 10^{-31}$ kg, $h = 6.626 	imes 10^{-34}$ J·s)

Accepted Answer

$5.10 	imes 10^{-8}$ m

Question 14

Which orbital has the highest energy in a multi-electron atom?

Accepted Answer

4f

Question 15

Which of the following transitions in the hydrogen atom emits light with the highest frequency?

Accepted Answer

$n=3 \rightarrow n=2$

Question 16

What is the de Broglie wavelength of an electron traveling at $2.00 	imes 10^6$ m/s? ($m_e = 9.11 	imes 10^{-31}$ kg, $h = 6.626 	imes 10^{-34}$ J·s)

Accepted Answer

$3.63 	imes 10^{-10}$ m

Question 17

Which rule states that electrons fill degenerate orbitals singly before pairing up?

Accepted Answer

Hund's Rule

Question 18

Which quantum number describes the orientation of an orbital in space?

Accepted Answer

Magnetic quantum number $m_l$

Question 19

Which of the following best explains the disappearance of the interference pattern when a laser is used to determine which slit an electron passes through?

Accepted Answer

The act of measurement collapses the electron's wavefunction, causing it to behave like a particle.

Question 20

Which of the following is the correct order of electromagnetic radiation in increasing frequency?

Accepted Answer

Radio waves < Infrared < Ultraviolet < Gamma rays

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