Wave period and wave speed

• What is one way in which energy may be transferred between stores?

  Waves
• What do both mechanical and electromagnetic waves transfer?

  Energy but not matter
• What is the equation to calculate the time period of a wave?

  • \(time \ period = \frac{1}{frequency}\)
  • \(T = \frac{1}{f}\)
• If a wave has a frequency of 5 Hz, what is its time period?

  $T =$$\frac{1}{5} =$$0.2~s$
• What is the time period of a wave with a frequency of 400 Hz?

  $T =$$\frac{1}{400} =$$0.0025~s$
• What is the equation to calculate wave speed?

  • \(wave \ speed = frequency \times wavelength\)
  • \(v = f \lambda\)
• What is the wave speed if the frequency is 50 Hz and the wavelength is 6 m?

  $v =$$50 \times 6 =$$300 \ m/s$
• What is the speed of a wave with a frequency of 0.2 Hz and a wavelength of 25 m?

  $v =$$0.2 \times 25 =$$5 \ m/s$
• What type of wave is sound classified as?

  • Mechanical wave
  • Longitudinal wave
• How does sound travel through different materials?

  It travels by collisions between particles
• What is the speed of sound in steel?

  6,000 m/s
• What is the speed of sound in water?

  1,500 m/s
• What is the speed of sound in air?

  330 m/s
• What happens to the speed of sound when it moves from one medium to another?

  The change in speed causes a change in wavelength, while frequency remains unaffected
• What is the relationship between wave speed, frequency, and wavelength?

  • Wave speed = frequency × wavelength
  • Constant frequency means wavelength is proportional to wave velocity