FSKS 123: Chapter 16 (Waves)

The distance between 4 peaks is 0.7 m. The wavelength of the wave is ​ (a)   m.​ The period of the wave is ​ (b)   s. The frequency of the wave is ​ ​ (c)   Hz. The amplitude of the wave is ​ (d)   cm. The speed of the wave is ​ ​ (e)   m/s

• 40
• 1.0
• 2.0
• 4.0
• 0.10
• 0.025
• 70.0
• 0.175
• 7.0
• 28.0

A transverse wave on a string has an amplitude 3A.

A tiny spot on the string is colored Green. As one cycle of the wave passes by, what is the total distance traveled by the green spot?

• 3 A

• 6 A

• 12 A

Answer explanation

The particle moves up from equilibrium line to the peak (3A),

and then back down to the equilibrium (3A), further down from equilibrium line to trough (3A)

and then back up to the equilibrium (3A)

3A + 3A + 3A + 3A = 12 A

As a wave moves through a medium at a speed v, the particles of the medium move in simple harmonic motion about their undisturbed positions.

When the amplitude of the wave triples, the wave speed v ______________.

• becomes 3 times bigger

• stays the same

• becomes one third (1/3)

• becomes 9 times bigger

Answer explanation

Wave speeds is only dependent on the properties of the rope, not the amplitude, wavelength or frequency

The speed of a wave on a string increases when you increase the ​ (a)   ​ of the rope, but wave speed decreases when you increase the ​ ​ (b)   of the rope

• tension
• linear density
• length
• amplitude of the disturbance
• price
• temperature

Answer explanation

• 10.18 W

• 2.26 W

• 6361.73 W

Answer explanation

Organize these options into the right categories

Groups:

(a) Gas

,

(b) Liquid

,

(c) Solids

• Yummy for eating

• Waves travel slowest here

• Lekker for drinking

• Waves travel fastest here

• Nice for breathing

• Waves travel with intermediate speed

Answer explanation

Answer explanation

Answer explanation

Intensity is proportional to 1/r^2

This means:

double r, I becomes I/4

tripple r, I becomes I/9

4 times r, I becomes 1/16 ...

Match the form of the doppler effect equation with the scenario described (CHECK FORMULA SHEET)

• Source and observer moving towards each other

• Source approaching stationary observer

• Source and observer stationary

• Source moving away from stationary observer

• Source and observer moving away from each other

Answer explanation

A blue car travels down the highway at a speed of 60km/h. The car's horn makes a sound at a frequency of 660 Hz.

A red passenger car traveling at 44 km/h is on the other side of the highway.

What is the frequency of the horn heard by a passenger in the red car?

• 489 Hz

• 607 Hz

• 718 Hz

• 482 Hz

Answer explanation