M6 Phy 2ndSem Midterm Chapter 1

Electromagnetic Waves

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Multiple Choice

The higher the frequency the ______ the energy. 

• higher
• lower
• neither, stays the same

Multiple Choice

The lower the frequency the ______ the energy.

• higher

• lower

• neither, stays the same

Multiple Choice

What do you have at 10³?
Wavelength Not Frequency

• Microwaves
• Infrared
• Radio
• X-Ray

Multiple Choice

What do you have at 10^-5?
Wavelength Not Frequency

• Microwaves
• Infrared
• Radio
• X-Ray

Multiple Choice

What do you have at 10^-2?
Wavelength Not Frequency

• Microwaves
• Infrared
• Radio
• X-Ray

Multiple Choice

What do you have at 10^-10?
Wavelength Not Frequency

• Microwaves
• Infrared
• Radio
• X-Ray

Multiple Choice

What do you have at 10^-8?
Wavelength Not Frequency

• Ultra Violet
• Visible
• Gamma Rays
• X-Ray

Multiple Choice

Which electromagnetic waves have the highest frequencies and the shortest wavelengths?

• microwaves
• visible light
• gamma rays

Multiple Choice

Which type of waves are used in broadcasting?

• radio waves
• infrared rays
• x-rays

Multiple Choice

Electromagnetic waves that help your body produce vitamin D are called?

• ultraviolet rays
• x-rays
• gamma rays

Multiple Choice

For waves in any medium, as the wavelength decreases, what happens to the frequency?

• It also decrease
• It stays the same
• It increases

Multiple Choice

How much of the electromagnetic spectrum is made up of visible light?

• only a small portion
• a very l;arge portion
• about half

Multiple Choice

Which of the following has wavelengths longer than microwaves?

• Infrared waves
• Radio waves
• Visible light

Multiple Choice

Which electromagnetic waves allow us to diagnose & treat cancer?

• Gamma rays
• X-rays
• Ultraviolet rays

Multiple Choice

The electromagnetic spectrum includes the complete range of electromagnetic waves placed in order of:

• increasing amplitutde
• increasing wavelength
• increasing frequency

Multiple Choice

Which of the following has frequencies higher than ultraviolet rays?

• visible light
• infrared rays
• x-rays

Multiple Choice

Which electromagnetic waves help doctors detect broken bones inside your body?

• gamma rays
• x-rays
• ultraviolet rays

Multiple Choice

Which of the following lists the electromagnetic waves in order of increasing wavelength?

• X-rays, visible light, radio waves
• gamma rays, microwaves, UV rays
• infrared rays, radio waves, x-rays

Multiple Choice

Which of the following lists the electromagnetic waves in order of decreasing frequency?

• X-rays, microwaves, infrared rays
• UV rays, visible light, x-rays
• infrared rays, microwaves, radio waves

Multiple Choice

All waves carry...

• Energy

• Matter

• Light

• Particles

Multiple Choice

Which section of the spectrum is the ONLY one we can see?

• X-Rays

• Gamma Rays

• Visible Light

• Ultraviolet Rays

Multiple Choice

Which has the longest wavelength and, therefore, the LOWEST frequency/energy

• Gamma Rays

• Visible Light Waves

• Radio Waves

• Infrared Waves

Multiple Choice

Which of the following electromagnetic waves has the lowest energy?

• Gamma Ray

• Visible Light

• Infrared

• Microwave

Multiple Choice

At what speed do electromagnetic waves travel through a vacuum?

• 3 x 10¹⁸ m/s

  or

  3,000,000,000,000,000,000

• 3 x 10⁷ m/s

  or

  30.000,000

• 3 x 10⁸ m/s

  or

  300,000,000

Multiple Select

What are the secondary colors?

• Magenta

• Blue

• Yellow

• Cyan

Multiple Select

What are the primary colors?

• Green

• Blue

• Yellow

• Red

Multiple Choice

Combining red light with green light creates _________.

• Red

• Blue

• Yellow

• Green

Multiple Choice

Combining red light with blue light creates _________.

• Red

• Magenta

• Yellow

• Green

Multiple Choice

Combining green light with blue light creates _________.

• Cyan

• Magenta

• Green

• Red

Multiple Choice

What is the wave speed equation?

• λ = $$\frac{c}{f}$$

• f = $$\frac{c}{\lambda}$$

• c = λf

Multiple Choice

What formula you will use in finding the wavelength of a certain EM Wave?

• λ = $$\frac{c}{f}$$

• f = $$\frac{c}{\lambda}$$

• c = λf

Multiple Choice

What formula you will use in finding the frequency of a certain EM Wave?

• λ = $$\frac{c}{f}$$

• f = $$\frac{c}{\lambda}$$

• c = λf

Multiple Choice

What formula you will use in finding the frequency of a certain EM Wave?

• λ = $$\frac{c}{f}$$

• f = $$\frac{c}{\lambda}$$

• c = λf

Multiple Choice

As the frequency of an electromagnetic wave increases, the amount of energy in that wave...

• Increases

• Stays the same

• Decreases

The Electromagnetic (EM) Spectrum

​Radiation is the transmission of energy through space or materials, and it can take many forms.

Most of these, like visible light and radio waves, are considered non-ionizing radiation and aren’t harmful in small amounts.

But when we get into ionizing radiation like X-rays and gamma rays, we’re talking about higher energy levels that can interact with matter in different ways. These are more powerful and can even produce ions, which is why they’re often used in medicine or science.


Can anyone think of an example of ionizing radiation that we encounter in everyday life?

​Radio Waves in Communication

These have the longest wavelengths in the spectrum, and they’re everywhere! Thanks to radio waves, we can transmit sounds and images over long distances, enabling things like radio, TV, and even cell phone communication.

Who among you here have listened to AM or FM radio? Can anyone explain the difference between AM and FM?

AM, or Amplitude Modulation, works by varying the amplitude of the waves, while FM, or Frequency Modulation, varies the frequency.

This gives FM higher sound quality—think of the difference in clarity between an AM news station and an FM music station.

Microwaves and Satellite Communication

Did you know they’re not just for heating food? Microwaves are used in satellite communications too! Satellites receive and amplify microwave signals, then transmit them across the globe, which is how we stay connected internationally.

Has anyone thought about how their cell phone works? How are microwaves involved in mobile communication?

Cell phones use microwaves to send and receive signals. Each phone tower covers a specific area called a “cell,” creating an overlapping network that allows mobile devices to stay connected as we move around.

Infrared and Visible Light

Infrared waves are used in things like remote controls and night vision goggles. Shorter wavelength infrared waves are perfect for low-heat applications like remote controls, while longer wavelengths, which carry more heat, are seen in things like fires or even the warmth from the sun.

Does anyone know how a remote control uses infrared?

When you press a button on the remote, it emits a pulse of infrared light. Though we can’t see it, many digital cameras can pick up this infrared light as a flashing signal.

Ultraviolet Light, X-Rays, and Gamma Rays

We get UV radiation from the sun, which helps our bodies produce vitamin D. But it’s also powerful enough to help us identify fake banknotes or sanitize water.

X-rays and gamma rays are even higher in energy; X-rays, for instance, are commonly used in medicine to see inside the body.

Has anyone had an X-ray before? What was it for?

X-rays pass through soft tissues but not bones, which is why they’re useful for seeing fractures.

Gamma rays, which are even more powerful, are sometimes used to treat cancer through a process called radiotherapy.

Multiple Choice

It is the transmission of energy through space or materials, and it can take many forms.

• Can't determine

• Ionizing

• Radiation

• Non-ionizing

Multiple Choice

Which electromagnetic waves are used in ovens and cell phone communications?

• Infrared rays
• ultraviolet rays
• microwaves

Multiple Choice

Which of the following electromagnetic waves is given off as heat?

• Radio Waves

• Visible Light

• Infrared Rays

• Gamma Rays

Multiple Choice

Which one has the highest frequency?

• gamma rays

• radio waves

Multiple Choice

Which one has the longest wavelength?

• radio waves

• gamma rays

Multiple Choice

Ultraviolet radiation would most likely lead to...

• skin cancer

• blindness

• heart attack

Reorder

Reorder the following according to the spectrum

• red

• orange

• yellow

• green

• blue

1

2

3

4

5

• 1
• 2
• 3
• 4
• 5

Multiple Choice

Communicating with satellites is an application of gamma rays.

• True

• False

Multiple Choice

This type of wave are considered non-ionizing radiation and aren’t harmful in small amounts.

• Gamma

• Xray

• Ultraviolet

• Visible light

Multiple Choice

This type of wave are considered ionizing radiation and harmful in small amounts.

• Gamma rays

• radiowaves

• microwaves

• Visible light

Multiple Choice

These waves are used in things like remote controls and night vision goggles.

• gamma rays

• Radiowaves

• Microwaves

• Infrared