5.1 Fundamentals of Waves

​5.1 Fundamentals of Waves

Nor Azman bin Tamit​

​What is waves? How waves are produced?

Oscillating or vibrating system produce waves.​

​What are the differences between two waves shown above?

​Do they have similarities?

​

Open Ended

What are the differences between transverse waves and longitudinal waves?

Amplitude, A = maximum displacement from still position.

Period​, T = time taken for one complete oscillation.

Frequency, f = ​number of complete oscillations in one second.

Wavelength, λ​ = distance between two consecutive crests/troughs.

Wave speed, v = distance travelled per second by a wave profile.​

​

Match

Match the following.

• Amplitude

• Period

• Frequency

• Wavelength

• Wave speed

maximum displacement from equilibrium position

time taken for complete oscillation

number of complete oscillations in one second

distance between two consecutive points in phase

distance travelled per second by a wave profile

• maximum displacement from equilibrium position

• time taken for complete oscillation

• number of complete oscillations in one second

• distance between two consecutive points in phase

• distance travelled per second by a wave profile

f = 1/T​

​f = 1/ 2 s = 0.5 Hz = 0.5 s^-1

v = λ​f = (10 cm)(0.5 s^-1)

= 5 cm s^-1​

​v = λf

λ = 10 cm

T = 2 s

​ v = 10 cm / 2 s = 5 cm s^-1

​

​v = λ/T

​What is the formula for v?

​Do Activity 5.5

(page 180)​

​Do Activity 5.6

(page 181)​

​Example of solution

​Question no 5 (page 226)

(a) Amplitude = 15 cm = 0.15 m

Period, T = 1/f = 1/5 = 0.2 s

Wavelength, λ ​= 1.2 m ÷ 2 = 0.6 m

​(b) Wave speed, v = Wavelength/Period = 0.6 m / 0.2 s

= 3 m s^-1​

Draw

Calculate the frequency of a transverse wave of wavelength 4 cm propagates at speed of 20 cm s^-1.

Open Ended

What did I learn today?