TUTTEE ACADEMY LOGO
broken image
  • Home
  • About Us
  • Subjects 
    • CHEMISTRY
    • BIOLOGY
    • PHYSICS
    • MATHEMATICS
    • PSYCHOLOGY
    • ECONOMICS
    • BUSINESS
    • COMPUTER SCIENCE
    • CHINESE
    • ENGLISH
    • SPANISH
    • IBDP IA / EE
    • IBDP TOK
    • ONLINE TUTORIAL
  • Exam Boards 
    • IBDP
    • IBMYP
    • IGCSE & GCSE
    • HKDSE
    • GCE A-LEVELS
  • Courses 
    • IBDP Tuition
    • GCE A-Level Tuition
    • IBMYP Tuition
    • I/GCSE Tuition
    • HKDSE Tuition
  • Admission Test Prep 
    • PREDICTED GRADE
    • SAT / SSAT
    • UKISET (UK)
    • BMAT
    • UKCAT / UCAT
    • LNAT
    • TMUA (Cambridge)
  • Student Results 
    • IBDP STUDENT RESULTS
    • IGCSE & GCSE MATHEMATICS
    • A-LEVEL STUDENT RESULTS
    • IGCSE STUDENT RESULTS
    • GCSE STUDENT RESULTS (UK)
    • HKDSE STUDENT RESULTS
    • OUR STORIES
  • Question Bank
  • Resources
SCHEDULE A LESSON NOW

IBDP Physics: Energy transfer and waves

Energy transfer and waves

· physics,ibdp physics,IB Physics,Energy transfer,waves

In this topic of IBDP Physics, we will learn about energy transfer and waves.

Energy transfer and waves

InIBDP Physics, Waves arevibrations that transfer energy from place to place without matter (solid, liquid or gas) being transferred. Think of a Mexican wave in a football crowd - the wave moves around the stadium, while each spectator stays in their seat, only moving up then down when it's their turn.

Some waves must travel through a substance. The substance is known asthe mediumand it can be solid, liquid or gas. Sound waves and seismic wavesare like this. They must travel through a medium, and it is the medium that vibrates as the waves travel through.

InIBDP Physics, Other waves do not need to travel through a substance. They may be able to travel through a medium, but they do not have to. Visible light, infrared rays,microwaves, and other types of electromagnetic radiation, are like this. They can travel through empty space. Electrical and magnetic fields vibrate as the waves travel.

Wave features

Amplitude

As waves travel, they set up patterns of disturbance. The amplitude of a wave is its maximum disturbance from its undisturbed position. It is important to note that the amplitude is not the distance between the top and bottom of a wave.

broken image

Wavelength

In IBDP Physics, The wavelength of a wave is the distance between a point on one wave and the same point on the next wave. It is often easiest to measure this from the trough of one wave to the crest of the next wave. But it doesn't matter where you measure it - as long as it is the same point on each wave.

Frequency

In IBDP Physics, The frequency of a wave is the number of waves produced by a source each second. It is also the number of waves that pass a certain point each second.

The unit of frequency is the hertz (Hz). It is common for kilohertz (kHz), megahertz (MHz) and gigahertz (GHz) to be used when waves have very high frequencies. For example:

  • most people cannot hear a high-pitched sound above 20 kHz
  • radio stations broadcast radio waves with frequencies of about 100 MHz
  • most wireless computer networks operate at 2.4 GHz

Period

The period of a wave is the time taken for one wave to be produced. It is also the time taken for one whole wave to pass a point. Period is measured in seconds.

Wavefront

In IBDP Physics, This is an imaginary surface that we draw to represent the vibrating part of a wave. If you draw semi-circular sound waves spreading out from a speaker, the semi-circular lines are the wavefront.

broken image

Wave Speed Equation

The speed of a wave is related to its frequency and wavelength, according to this equation:

where:

v is the wave speed in metres per second, m/s

f is the frequency in hertz, Hz

λ (lambda) is the wavelength in metres, m

broken image

All waves, including sound waves and electromagnetic waves, follow this equation. It should be noted that some particular waves have their own specific speeds:

  • the speed of light and all of the electromagnetic spectrum in a vacuum (in vacuo) is 300,000,000 m/s or 3×108m/s
  • the speed of sound in air is 340 m/s
Frequency and time period

In IBDP Physics, The frequency of a wave can be calculated using this equation:

frequency = 1/ time period

f= 1/T

where:

f is the number of waves produced by a source per second, it is measured in hertz (Hz).

T is the time it takes for one complete oscillation, it is measured in seconds.

All waves, including sound waves and electromagnetic waves, follow this equation. For example, a wave with a time period of 2 seconds has a frequency of 1 ÷ 2 = 0.5 Hz.

This is the end of this topic.

broken image

CLICK HERE TO LEARN MORE ABOUT OUR IBDP PHYSICS COURSES

SIGN UP FOR A FREE IBDP PHYSICS TRIAL
Subscribe
Previous
AS/A-level Physics: Diffraction gradient
Next
IBDP English: The history of English --Part 1
 Return to site
Profile picture
Cancel
Cookie Use
We use cookies to improve browsing experience, security, and data collection. By accepting, you agree to the use of cookies for advertising and analytics. You can change your cookie settings at any time. Learn More
Accept all
Settings
Decline All
Cookie Settings
Necessary Cookies
These cookies enable core functionality such as security, network management, and accessibility. These cookies can’t be switched off.
Analytics Cookies
These cookies help us better understand how visitors interact with our website and help us discover errors.
Preferences Cookies
These cookies allow the website to remember choices you've made to provide enhanced functionality and personalization.
Save