16430528
Descripción
Test por Jeffrey Piggott, actualizado hace más de 1 año
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Creado por Jeffrey Piggott
hace casi 6 años
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Pregunta 1
Pregunta
The diagram shows two sinusoidal waveforms.
At time t = 0 the waves are in phase. At the dotted line, t = 18 s.
At which time is the phase difference between the two oscillations ⅛ of a cycle?
Image:
Q1 (binary/octet-stream)
Respuesta
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A 4.0 s
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B 4.5 s
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C 8.0 s
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D 9.0 s
Pregunta 2
Pregunta
A signal has a frequency of 2.0 MHz.
What is the period of the signal?
Respuesta
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A 2 µs
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B 5 µs
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C 200 ns
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D 500 ns
Pregunta 3
Pregunta
A displacement-time graph for a transverse wave is shown in the diagram.
The phase difference between X and Y can be expressed as nπ.
What is the value of n?
Image:
Q3 (binary/octet-stream)
Respuesta
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A 1.5
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B 2.5
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C 3.0
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D 6.0
Pregunta 4
Pregunta
The frequency of a certain wave is 500 Hz and its speed is 340 ms^–1.
What is the phase difference between the motions of two points on the wave 0.17 m apart?
Respuesta
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A π/4 rad
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B π/2 rad
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C 3π/4 rad
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D π rad
Pregunta 5
Pregunta
Noise reduction headphones actively produce their own sound waves in order to cancel out external sound waves.
A microphone in the headphones receives waves of one frequency. A loudspeaker in the headphones then produces a wave of that frequency but of a different phase.
What is the phase difference between the external sound wave and the wave produced by the loudspeaker in the headphones?
Respuesta
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A 90°
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B 180°
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C 270°
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D 360°
Pregunta 6
Pregunta
The diagram shows a standing wave on a string. The standing wave has three nodes N1, N2 and N3.
Which statement is correct?
Respuesta
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A All points on the string vibrate in phase.
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B All points on the string vibrate with the same amplitude.
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C Points equidistant from N2 vibrate with the same frequency and in phase.
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D Points equidistant from N2 vibrate with the same frequency and the same amplitude.
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