Waves and Frequencies in Physics
15 Questions
2 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

A wave is a regular sequence of what?

pulses

What are the two types of wave motions, namely in a string or spring, and sound waves?

  • Sound waves
  • Longitudinal waves (correct)
  • Transverse waves (correct)
  • Circular waves

A transverse wave is a wave in which the disturbance is perpendicular to the propagation direction of the wave.

True (A)

What is the center line of the wave called?

<p>the undisturbed string or rope</p> Signup and view all the answers

What is the highest point of the wave called?

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

Two points on a wave move in phase when they move in the same direction at the same speed and have the same displacement from the position of rest.

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

What is the distance between two crests or two troughs of one wavelength called?

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

What is the frequency of a wave measured in?

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

The time it takes to complete one wave (full wave) is measured in what?

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

The relation between the frequency (f) and period (T) is represented by: f = ______

<p>1/T</p> Signup and view all the answers

What is the speed of a wave calculated by making use of the wave equation?

<p>speed = frequency x wavelength</p> Signup and view all the answers

What is the distance between 19 constructive compressions (measured in the middle of each compression) of a longitudinal wave called?

<p>The length of 18 full waves</p> Signup and view all the answers

In the speed of a longitudinal wave, the particles in the medium undergo a to and fro motion, we say that the particles vibrate in the direction wherein the longitudinal wave propagates, The speed of the wave itself. Because the particles of the medium (for example in the spiral) and the speed of the wave itself. Because the particles of the medium undergo a to and fro motion, we say that the particles vibrate in the direction wherein the longitudinal wave propagates, the speed of the wave itself. Because the particles of the medium undergo a to and fro motion, we say that the particles vibrate in the direction wherein the longitudinal wave propagates., The speed of the wave itself.

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

What does part A, C, E and G represent in the diagram of the spring?

<p>The compression</p> Signup and view all the answers

What is the layout of the coils in the spring in the part A, C, E and G?

<p>When compressed there close to each other</p> Signup and view all the answers

Flashcards

Frequency (f)

The number of compressions or rarefactions that pass a given point in one second, measured in Hertz (Hz).

Period (T)

The time it takes for one complete wave to move past a point, measured in seconds (s).

Speed of a Longitudinal Wave (v)

The speed at which a longitudinal wave travels through a medium, calculated using the equation: Speed = Frequency × Wavelength, or v = fλ

Wavelength of a Longitudinal Wave (λ)

The distance between two successive points in phase on a longitudinal wave, measured in meters (m).

Signup and view all the flashcards

Wave

A regular sequence of pulses (or disturbances) that transmit energy from one point to another in a medium.

Signup and view all the flashcards

Transverse Wave

A wave formed by holding one end of a spring and moving the other end back and forth. The disturbance is perpendicular to the direction of propagation.

Signup and view all the flashcards

Equilibrium Position

The position of the undisturbed string/rope. Also referred to as the equilibrium position.

Signup and view all the flashcards

Crest

The highest point of a transverse wave.

Signup and view all the flashcards

Trough

The lowest point of a transverse wave.

Signup and view all the flashcards

In Phase

Two points on a wave are in phase if they move in the same direction, at the same speed, and have the same displacement from the equilibrium position.

Signup and view all the flashcards

Out of Phase

Two points on a wave are out of phase if they move in different directions.

Signup and view all the flashcards

Wavelength (λ)

The distance between two successive points in phase on a wave, measured in meters (m).

Signup and view all the flashcards

Frequency (f)

The number of whole waves that pass a fixed point in one second. Measured in Hertz (Hz).

Signup and view all the flashcards

Period (T)

The time it takes to complete one full wave (one wavelength) to move past a point in a medium, measured in seconds.

Signup and view all the flashcards

Frequency and Period Relationship

The relationship between frequency (f) and time period (T). f = 1/T and T=1/f

Signup and view all the flashcards

Interference

The effect two or more pulses have on each other when superimpose.

Signup and view all the flashcards

Constructive Interference

When two pulses meet on the same side of the medium (e.g., both above or below the equilibrium position) and add together to form a higher pulse with a larger amplitude.

Signup and view all the flashcards

Destructive Interference

When two pulses meet on opposite sides of the medium and weaken each other to form a smaller pulse or even a momentary absence of a pulse.

Signup and view all the flashcards

Amplitude

The maximum displacement or disturbance of a wave from its equilibrium position, measured in meters (m).

Signup and view all the flashcards

Longitudinal Waves

Waves where the disturbance (displacement) of the medium is parallel to the propagation direction of the wave.

Signup and view all the flashcards

Pulse

A single disturbance that travels through a spring or rope, creating a change in the medium's position.

Signup and view all the flashcards

Rest Position (Equilibrium)

The position of the rope or spring when no pulse is present.

Signup and view all the flashcards

Amplitude

The maximum displacement of a particle from its rest position.

Signup and view all the flashcards

Pulse Length

The distance from the start to the end of a pulse.

Signup and view all the flashcards

Pulse Speed

The rate at which a pulse travels through a medium

Signup and view all the flashcards

Positive Pulse

The peak of the pulse, which moves in the opposite direction to a trough.

Signup and view all the flashcards

Negative Pulse

The trough, which is opposite to a peak, and moves in the opposite direction.

Signup and view all the flashcards

Propagation Direction

The direction in which the pulse itself moves along the rope (or spring).

Signup and view all the flashcards

Transverse Pulse

When particles in the medium move perpendicular to the propagation direction.

Signup and view all the flashcards

Study Notes

Frequency

  • The frequency (f) is the number of compressions or rarefactions that pass a given point in one second and is measured in hertz (Hz).

Period

  • The period (T) of a longitudinal wave is the same as with a transverse wave; the time that it takes for one complete wave (one wavelength) to move past a point and is measured in second (s).
  • Thus (f) frequency and (T) period: f = 1/T and T = 1/f

Speed of a Longitudinal Wave

  • We must distinguish between the speed of the particles in the medium (for example in the spiral) and the speed of the wave itself. Because the particles in the medium undergo a to and fro motion, we say that the particles vibrate in the direction wherein the longitudinal wave propagates. Therefore, the particles also change as they move still in the same direction to the maximum speed displacement from their original position. The particles change direction and accelerates back to the position of rest in one direction and then move back to the position of rest again and accelerates into the opposite direction of displacement. The particles change direction again and accelerates back to the position of rest.
  • The speed (v) of a longitudinal wave can be calculated by making use of the wave equation.
  • Speed = frequency × wavelength or in symbol form v = fλ

Example 1

  • The distance between 19 consecutive compressions (measured in the middle of each compression) of a longitudinal wave is 720 mm while the compressions move a distance of 800 mm in 5 s. Calculate: (1) the speed of the propagated waves (2) the wavelength (3) the frequency of the wave.

  • Solution: (1) v = D/t = 800 mm/5 s = 0.8 m/s (2) The wavelength is the length of one complete wave λ = 720 mm/18 = 40 mm = 0.04 m (3) v = fλ âžž f = v/λ = 0.16 m/s / 0.04 m = 4 Hz

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Quiz Team

Description

This quiz explores key concepts related to waves, including frequency, period, and the speed of longitudinal waves. You will learn how these concepts interact and are measured in various ways. Test your knowledge on wave behavior and properties to solidify your understanding.

More Like This

Use Quizgecko on...
Browser
Open
Browser
Browser