Q: A green laser emits light with a wavelength of $$515\ \text{nm}. $$What is the frequency of this light? (Speed of light $$c = 3.00 \times 10^8$\ \text{m/s}) $$Use $$v = \dfrac{c}{\lambda}.$$

$$5.83 \times 10$$^{14}$$\ \text{Hz}$$

Question 1

Which observation from Rutherford’s gold foil experiment led to the conclusion that atoms contain a small, dense nucleus?

Accepted Answer

Some alpha particles were deflected at large angles, and a few even bounced back.

Question 2

According to the nuclear theory of the atom, which statement is correct?

Accepted Answer

Most of the atom’s mass and all of its positive charge are concentrated in the nucleus.

Question 3

Which subatomic particle was discovered by James Chadwick in 1932 to account for previously unaccounted atomic mass?

Accepted Answer

Neutron

Question 4

Given the following masses, which particle has the smallest mass?

$$	ext{Proton: } 1.67262 	imes 10$$^{-27}$$ 	ext{ kg}$$
$$	ext{Neutron: } 1.67493 	imes 10$$^{-27}$$ 	ext{ kg}$$
$$	ext{Electron: } 9.11 	imes 10$$^{-31}$$ 	ext{ kg}$$

Accepted Answer

Electron

Question 5

Which property of light determines its color?

Accepted Answer

Frequency or wavelength

Question 6

A green laser emits light with a wavelength of $$515\ 	ext{nm}. $$What is the frequency of this light? (Speed of light $$c = 3.00 	imes 10^8$\ 	ext{m/s})

$$Use $$v = \dfrac{c}{\lambda}.$$

Accepted Answer

$$5.83 	imes 10$$^{14}$$\ 	ext{Hz}$$

Question 7

Arrange the following types of electromagnetic radiation in order of increasing wavelength: X-ray, visible, infrared.

Accepted Answer

X-ray \u003c visible \u003c infrared

Question 8

Which statement best describes the difference between a bright green laser and a dim red laser?

Accepted Answer

The two lasers emit light of different frequencies, and the green laser has greater amplitude.

Question 9

Which phenomenon demonstrates the wave nature of light by producing an interference pattern when light passes through two closely spaced slits?

Accepted Answer

Double-slit interference

Question 10

What is the relationship between wavelength ($$\lambda) $$and frequency ($$v) $$for electromagnetic waves traveling at the speed of light ($$c$$)?

Accepted Answer

$$c = \lambda 	imes v$$

Question 11

Which of the following statements about the quantum mechanical model of the atom is correct?

Accepted Answer

The electron’s energy-like characteristics explain chemical and physical properties of matter.

Question 12

Which type of electromagnetic radiation has the highest energy?

Accepted Answer

Gamma rays

Question 13

If a wave has a large amplitude and high frequency, what can be said about its total energy?

Accepted Answer

It has high energy.

Question 14

Which property of electromagnetic waves is responsible for their ability to cause biological damage (e.g., ionizing radiation)?

Accepted Answer

High energy (short wavelength, high frequency)

Question 15

Which of the following is NOT a consequence of the wave-matter duality of electrons?

Accepted Answer

Electrons always behave as classical particles.

Question 16

A barcode scanner emits red light with a frequency of $$4.62 	imes 10$$^{14}$$\ 	ext{Hz}. $$What is the wavelength of this light in nanometers? ($$c = 3.00 	imes 10^8$\ 	ext{m/s})$$

Accepted Answer

$$649\ 	ext{nm}$$

Question 17

Which statement about constructive and destructive interference is correct?

Accepted Answer

Constructive interference occurs when waves are in phase and produce a larger wave.

Question 18

Which of the following best explains why atoms are electrically neutral?

Accepted Answer

Atoms have equal numbers of protons and electrons.

Question 19

Which scientist’s work led to the discovery of the neutron?

Accepted Answer

James Chadwick

Question 20

Which of the following is a real-world consequence of the quantum mechanical model of the atom?

Accepted Answer

It explains why some elements are metals and others are nonmetals.

Structure of the Atom and the Nature of Light: Early Atomic Models and Quantum Theory

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