Wave Motion - Selected Topis in Physics
- 1. WAVE MOTION BY: AIMEE R. PAREÑO
- 2. WAVE is a disturbance that carries energy through matter or space. MEDIUM – the matter through which wave travels.
- 3. TYPES OF WAVES: MECHANICAL WAVES waves that requires a medium ELECTROMAGNETIC WAVES waves that do not require a medium PULSE WAVE wave that consists of a single traveling pulse PERIODIC WAVES the continues generation of pulses (pulse wave)
- 4. CLASSIFICATIONS OF WAVES ACCORDING TO THE DIRECTION OF MOTION OF THE MEDIUM LONGITUDINAL WAVES – the vibrations are along the direction of the wave. TRANSVERSE WAVES – the vibrations are at a right angle or perpendicular to the direction of the wave.
- 5. CLASSIFICATIONS OF WAVES (A) Transverse waves (B) Longitudinal waves
- 6. LONGITUDINAL WAVES COMPRESSION the region where the coils of the spring are pressed together RAREFACTION the region where the coils of the spring are spread out.
- 7. TRANVERSE WAVES CRESTS the points where the coils of the spring are at the highest. TROUGHS the points of the coils of the spring are at the lowest.
- 8. MEASURES OF A WAVE
- 9. WAVEFORM a picture of a wave AMPLITUDE the maximum displacement of the particles of the medium from their equilibrium WAVELENGTH the distance between neighboring displacements The distance between two successive crests or troughs, or between two successive compressions or rarefactions
- 10. AMPLITUDE AND WAVELENGTH OF THE A WAVE
- 11. WAVE MOTION CAN BE DESCRIBED IN TERMS OF ITS SPEED v = λ / T and T = 1 / f then, v = λ / 1/f therefore, v = λ f where v – velocity of the wave λ – wavelength f – frequency of the wave
- 12. Sample Problem If a dog whistle has a frequency of 30 000 Hz, what is the wavelength of the sound emitted? (speed of sound = 340 m/s)
- 13. Solution: Given: v = 340 m/s f = 30 000 Hz = 30 000 /s v = λ f -> λ = v / f λ = 340 m/s 30 000 /s = 0.011 m
- 14. Evaluation Complete the table 150 (b) 300 3 150 (a) (c) 2 250 Velocity (m/s) Wavelength (m) Frequency (Hz)
- 15. Assignment What is the period of the wave while Aaron is surfing if the wave propels him toward the beach with a speed of 5.0 m/s and the wave crests are 2.0 m apart?
- 16. THE END