Progressive Waves (Part 2)

​Progressive Waves (part 2)

​JC 1 Physics

• CRO

• Wave equations

• Intensity of Wave

Multiple Choice

RECAP:

The separation XY on the graph represents the ………(1)…………… of the wave.

X and Y have equal ……………(2)……………

 

Which words correctly complete gaps 1 and 2?

Multiple Choice

RECAP:

What is phase difference between X and Y?

• 45°

• 135°

• 180°

• 270°

​Cathode Ray Oscilloscope (CRO)

Multiple Choice

The cathode-ray oscilloscope (c.r.o) is used to display the trace from a sound wave. The time base is set at 10 ms per division.

What is the period of the signal shown?

• 20 ms

• 30 ms

• 40 ms

• 80 ms

Multiple Choice

A microphone is connected to a cathode-ray oscilloscope (CRO). A sound wave of constant

frequency is detected by the microphone. The screen of the CRO is shown.

The time-base is set at 1.0 ms cm^–1.

What is the frequency of the sound wave?

• 250 Hz

• 500 Hz

• 670 Hz

• 4000 Hz

Multiple Choice

The Y-input terminals of a cathode-ray oscilloscope (c.r.o.) are connected to a supply of

amplitude 5.0 V and frequency 50 Hz.

The time-base is set at 10 ms per division and

the Y-gain at 5.0 V per division.

Which trace is obtained?

Draw

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Deriving Wave equation

Draw

Complete to derive wave equation

Multiple Choice

The wave frequency is 100 Hz. Find the wave speed.

• 40 cm/s

• 80 cm/s

• 120 cm/s

• 100 cm/s

Multiple Choice

From these graphs, determine the speed of the wave

• 3 cm/s

• 3 m/s

• 6 m/s

• -2 cm/s

Multiple Choice

A sound wave has a speed of 330 ms^-1 and a frequency of 50 Hz.

What is a possible distance between two points on the wave that have a phase difference of 60°

• 0.03 m

• 1.1 m

• 2.2 m

• 6.6 m

Multiple Choice

The amount of energy per second carried through a unit area by a wave.

• Intensity
• Electromagnetic spectrum
• X-rays
• Visible light

Multiple Choice

The intensity of a wave is equal to the wave power (P ) divided by the _______.

• Area

• Time

• Distance

• Energy

Multiple Choice

A wave of amplitude a has an intensity of 3.0 Wm^–2.

What is the intensity of a wave of the same frequency that has an amplitude 2a?

• 4.2 Wm^–2

• 6.0 Wm^–2

• 9.0 Wm^–2

• 12 Wm^–2

Multiple Choice

A wave of amplitude A has an intensity I.

After passing through a certain medium, the wave has a new intensity of ¼ I

What is the new amplitude of the wave?

• 2 A

• ½ A

• ¼ A

• ⅛ A

Multiple Choice

What is the ratio of $$\frac{intensity\ of\ wave\ X}{intensity\ of\ wave\ Y}$$

• 0.33

• 3

• 4

• 9