Properties of Waves Ms T 4 Basic Properties

Properties of Waves Ms. T.

4 Basic Properties of Waves O Amplitude O Wavelength O Frequency O Speed

Amplitude O Maximum distance the particles of the medium carrying the wave move away from the resting place

Amplitude of Transverse Wave O The maximum distance the medium moves up or down from the resting place. O Measure from resting place to top of crest or to bottom of trough DRAW ME!

Amplitude of Transverse Wave O The amplitude of the wave is related to the energy of the wave. O The greater the energy the greater the amplitude. Amplitude = 1 cm Amplitude = 3 cm

Amplitude of a Longitudinal Wave O A measure of how compressed or rarefied the medium becomes O Greater amplitude= tighter the longitudinal compression

Property 2: Wavelength O The distance from crest to crest or from trough to trough is one wavelength. O A wave travels a certain distance before it repeats. 2 cm 1 cm WAVELENGTH

Frequency O The number of waves that pass a certain point in a certain amount of time. O Frequency is measured in HERTZ (Hz) per second O A wave that passes a point every second has a frequency of 1 Hz. If 2 waves pass a point every second, it has a frequency of 2 Hz. O Go To this animation click below: O http: //www. pbslearningmedia. org/asset/lsp s 07_int_frequency/

Speed O Different waves travel at different speeds. O Speed = the distance a wave travels in a certain amount of time O Formula: Speed = Wavelength x Frequency O Example: If a wave has a wavelength of 2 meters and a frequency of 3 Hz , What is the speed? O S=Wx. F O S = 2 m x 3 Hz O S = 6 m/s

Formulas for Frequency & Wavelength O If you know 2 of the values in the speed formula, you can find the third quantity: O Frequency = Speed Wavelength O Wavelength = Speed Frequency

Find Speed Using Formula: OS=Wx. F O A wave has a wavelength of 3 mm and a frequency of 4 Hz. What is the speed? OS=Wx. F O S = 3 mm x 4 Hz O S = 12 mm/s O A wave has a wavelength of 5 cm and a frequency of 2 Hz. What is the speed? OS=Wx. F O S = 5 cm x 2 Hz O S = 10 cm/s

Finding Frequency using Formula OF= S W or F = S ÷ W O A wave has a speed of 6 cm/s and a wavelength of 2 cm. What is the frequency of the wave? O F = S/W O F =6/2 (divide) O F= 3 Hz O A wave as a speed of 10 mm/s and a wavelength of 5 cm. What is the frequency of the wave? O F = S/W O F =10/5 (divide) O F= 2 Hz

Finding Wavelength using Formula O Wavelength = Speed or Frequency W = S÷F O A Wave has a speed of 12 m/s and a Frequency of 2 Hz. What is its wavelength? O W= S/F O W = 12/2 O W = 6 m O A wave has a speed of 24 cm/s and a frequency of 6 Hz. What is its wavelength? O W= S/F O W = 24/6 O W = 4 m

Summary: What I should know and be able to do. O What are the 4 properties of waves? O Which wave property is directly related to energy? O Which wave properties are distances? O Which wave properties are relative to time? O What is the formula for speed? Frequency? Wavelength? O 2 Waves have the same wavelength and frequency. How do their speeds compare? O Calculate: A wave’s frequency is 2 Hz and its wavelength is 4 m. What is the wave’s speed?