Physics - Waves & The Electromagnetic Spectrum

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Questions and Answers

Which statement best describes transverse waves?

  • They only occur in solids.
  • Vibrations are perpendicular to the direction of energy transfer. (correct)
  • Vibrations are parallel to the direction of energy transfer.
  • They do not transfer energy.

In a longitudinal wave, the vibrations are perpendicular to the direction of energy transfer.

False (B)

What is the term for the distance between the highest point and the midpoint of a wave?

Amplitude

The highest point of a wave is called the ______.

<p>crest</p> Signup and view all the answers

Match the following terms with their definitions:

<p>Wavelength = Distance between consecutive peaks or compressions Frequency = Number of waves passing a point in one second Amplitude = Maximum distance from rest position Period = Time taken for one wave to pass a point</p> Signup and view all the answers

What is the wave equation?

<p>v = f × λ (A)</p> Signup and view all the answers

A sound wave in air is an example of a transverse wave.

<p>False (B)</p> Signup and view all the answers

If a wave has a speed of 12 m/s and a wavelength of 0.4 m, what is its frequency?

<p>30 Hz</p> Signup and view all the answers

The distance a surfer travels in a wave of 52 m in 8 seconds results in a speed of ______.

<p>6.5 m/s</p> Signup and view all the answers

What measurement is taken first in the procedure to measure wave speed using a ripple tank?

<p>Frequency from the vibration generator (D)</p> Signup and view all the answers

What is a transverse wave?

<p>Vibrations are at right angles (perpendicular) to the direction of energy transfer of the wave.</p> Signup and view all the answers

What is a longitudinal wave?

<p>Vibrations are parallel (in the same direction) to the direction of energy transfer</p> Signup and view all the answers

Transverse waves only move __ and __ and can be transferred for __ ____. Longitudinal waves only ___ __ and ___ __ a little bit, these are called ______ and ______ where the energy can be transferred for __ ____.

<p>up, down, long distances, bunch up, spread out, compressions, rarefactions, long distances</p> Signup and view all the answers

Sound travels fastest in solids rather than liquids or gases because the particles are ___ ____. The more ___ ___ the particles are the faster the sound travels.

<p>closest together, densely packed</p> Signup and view all the answers

What is velocity?

<p>Speed in a direction (A)</p> Signup and view all the answers

Which wave type involves vibrations at right angles to the direction of energy transfer?

<p>Transverse waves (C)</p> Signup and view all the answers

Longitudinal waves can travel through solids but not through liquids or gases.

<p>False (B)</p> Signup and view all the answers

In transverse waves, vibrations are _______ to the direction of energy transfer.

<p>perpendicular</p> Signup and view all the answers

What is the effect called when light rays bend as they travel through different materials?

<p>Refraction (A)</p> Signup and view all the answers

Light travels faster through water than it does through air.

<p>False (B)</p> Signup and view all the answers

What happens to the wavelength of light when it enters a medium like glass?

<p>It decreases.</p> Signup and view all the answers

When a wave is ______, it transfers all of its energy to the material.

<p>absorbed</p> Signup and view all the answers

Match the following actions to their descriptions:

<p>Reflection = Bounces back off a material Transmission = Passes through a material Absorption = Transfers energy to a material Refraction = Bends as it passes into a different medium</p> Signup and view all the answers

Match the following aspects of the refraction diagram represented by letters to what they are called:

<p>A = Angle of Incidence B = Angle of Refraction C = Normal Line D = Glass Block</p> Signup and view all the answers

What should the second person do when they see the first person bang the blocks together?

<p>Start the stopwatch (B)</p> Signup and view all the answers

The speed of sound can only be measured over a single distance.

<p>False (B)</p> Signup and view all the answers

What is the first measurement taken to conduct the speed of sound experiment?

<p>Distance of 100 meters</p> Signup and view all the answers

The person holding the wooden blocks begins the experiment by ______ the blocks together.

<p>banging</p> Signup and view all the answers

Match the steps of the speed of sound measurement procedure with their descriptions:

<p>Measure distance = Use a trundle wheel to determine the spacing. Start stopwatch = Begin timing when the first person bangs the blocks. Stop stopwatch = End timing when the sound is heard. Calculate average time = Compute the mean of several measurements.</p> Signup and view all the answers

What is the first measurement to be taken when measuring waves using a ripple tank?

<p>Set up the ripple tank apparatus (A)</p> Signup and view all the answers

The speed of sound waves is calculated using the recorded frequency and the wavelength of the metal rod.

<p>True (A)</p> Signup and view all the answers

What equipment is used to create wave patterns in a ripple tank?

<p>Light source</p> Signup and view all the answers

To determine the wavelength of waves, you need to measure the length of the screen and divide by the number of _______.

<p>wave fronts</p> Signup and view all the answers

Match the equipment to its corresponding wave measurement method:

<p>Wooden bar = Measuring waves in solids Ripple tank = Measuring waves on water Hammer = Striking the metal rod Smartphone = Recording frequency</p> Signup and view all the answers

What is a common use for ultraviolet waves?

<p>Killing bacteria (B)</p> Signup and view all the answers

Gamma rays are primarily used for communication.

<p>False (B)</p> Signup and view all the answers

What is the speed of microwave waves in meters per second?

<p>3 x 10^8</p> Signup and view all the answers

The type of wave used for thermal imaging is ______.

<p>Infrared</p> Signup and view all the answers

Match the following types of electromagnetic waves with their uses:

<p>Radio Waves = Communication (radio, TV) X-rays = Medical usage Visible Light = Seeing Gamma rays = Cancer treatment</p> Signup and view all the answers

What happens to visible light when it is too intense?

<p>It leads to blindness. (B)</p> Signup and view all the answers

Higher frequency waves have longer wavelengths.

<p>False (B)</p> Signup and view all the answers

What is one potential danger of exposure to microwaves?

<p>Painful burns</p> Signup and view all the answers

White light can be split into a spectrum of colors using a ______.

<p>prism</p> Signup and view all the answers

Match each type of wave to its corresponding danger:

<p>Infrared = Burns Ultraviolet = Sunburn (risk of cancer) X-rays = Cancer risk Microwaves = Painful burns</p> Signup and view all the answers

Flashcards

Transverse Waves

Vibrations move perpendicular to the direction of energy transfer. Imagine a rope moving up and down, while the wave travels horizontally.

Longitudinal Waves

Vibrations move parallel to the direction of energy transfer. Think of a spring moving back and forth, while the wave travels along the spring.

Crest/Peak

The highest point of a wave.

Trough

The lowest point of a wave.

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Wavelength

Distance between two identical points on consecutive waves. For transverse waves, it's measured from peak to peak, for longitudinal waves, it's measured between compressions.

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Amplitude

The maximum distance a point on a wave travels from its rest position.

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Frequency

The number of waves passing a point in one second. Measured in Hertz (Hz).

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Period

The time taken for one complete wave to pass a given point. Measured in seconds.

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Wavelength in a Solid

In a solid, the wavelength of a wave can be calculated by doubling the length of the solid, as the wave reflects from both ends.

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Wave Equation

The relationship between wave speed, frequency and wavelength. It states that: velocity of wave (v) = frequency (f) x wavelength (λ).

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Refraction

The bending of light as it passes from one medium to another, caused by a change in speed.

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Light's speed in different mediums

Light travels slower through water and glass compared to air, causing it to bend when entering or exiting these materials.

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How does light bend?

The change in direction of light rays as they pass from one medium to another, causing it to bend.

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Light in a glass block

When light enters a glass block, its speed decreases, but its frequency remains the same. As a result, its wavelength becomes shorter.

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Measuring speed of sound

A method used to calculate the speed of sound by measuring the time it takes for sound to travel a known distance.

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Speed of sound

The distance sound travels in a given time. It is measured in meters per second (m/s).

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Measuring the speed of sound

A method used to determine the speed of sound by timing how long it takes for sound to travel a known distance.

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Trundle wheel

A device used to measure distances, commonly used in experiments involving the speed of sound.

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Period (of a sound wave)

The time it takes for one complete wave to pass a point. Measured in seconds. It's the reciprocal of frequency.

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Frequency (of a sound wave)

The number of sound waves passing a point in one second. Measured in Hertz (Hz).

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Wave Speed

The speed at which a wave propagates through a medium. It is determined by the properties of the medium and the type of wave.

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Wavefronts

A visual representation of waves, often used in experiments to observe and measure wave characteristics.

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Scalar Quantities

Quantities that only have a magnitude, like distance or speed.

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Vector Quantities

Quantities that have both magnitude and direction, like velocity or force.

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Speed of Light

The speed at which all electromagnetic waves travel in a vacuum.

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Electromagnetic Spectrum

A continuous range of electromagnetic radiation, encompassing waves of different frequencies and wavelengths.

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Visible Light

The full range of wavelengths of light that humans can see, appearing as a rainbow.

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Splitting Light

The ability of a prism to split white light into its component colors, like a rainbow.

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Radio Waves

Waves used for communication, such as radio and television.

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Microwaves

Waves used for microwave ovens, satellite communication, and wifi.

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Infrared Waves

Waves that produce heat and are used in thermal imaging and night vision.

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X-rays

Waves used in medical imaging and security markings.

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Study Notes

Transverse Waves

  • Vibrations are perpendicular to the direction of energy transfer.
  • Example: Water waves

Longitudinal Waves

  • Vibrations are parallel to the direction of energy transfer.
  • Example: Sound waves

Wave Properties

  • Wavelength: The distance between two consecutive points in a wave (e.g., crest to crest or trough to trough). Measured in meters (m).
  • Frequency: The number of waves passing a point in one second. Measured in Hertz (Hz).
  • Amplitude: The maximum distance of a point on a wave from its rest position.
  • Period: The time it takes for one complete wave cycle to pass a given point.

Wave Equation

  • Velocity of a wave = frequency × wavelength
  • Units: Velocity (m/s), frequency (Hz), wavelength (m)

Measuring Waves

  • Ripple tank: Used to investigate waves. Steps include: measure frequency, measure distance of 10 wavelengths, divide distance by 10 to get wavelength, use wave equation to calculate speed..

Sound Speed in Different Media

  • Sound travels fastest in solids because particles are closest together.
  • Sound travels slower in liquids than solids, and slowest in gases.
  • Sound waves travel through solids by particles vibrating and colliding with their neighbors. This transfer of vibrations causes the sound to travel through the material.
  • Sound waves travel through gases more slowly, causing a delay between when a particle vibrates and the particle next to it vibrates.
  • Sound travels fastest in solids, slower in liquids, and slowest in gases.
  • In solids, sound travels faster as particles are closer together. In liquids and gases sound travels slower as the particles are further apart.
  • Sound travels through a medium by particles vibrating and colliding with neighbors.

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