9702 Quick Quiz on Period and Phase Difference

Description

Short Quiz on phase difference for AS Level Physics U14 Waves
Jeffrey Piggott
Quiz by Jeffrey Piggott, updated more than 1 year ago
Jeffrey Piggott
Created by Jeffrey Piggott almost 6 years ago
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Resource summary

Question 1

Question
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?
Answer
  • A 4.0 s
  • B 4.5 s
  • C 8.0 s
  • D 9.0 s

Question 2

Question
A signal has a frequency of 2.0 MHz. What is the period of the signal?
Answer
  • A 2 µs
  • B 5 µs
  • C 200 ns
  • D 500 ns

Question 3

Question
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?
Answer
  • A 1.5
  • B 2.5
  • C 3.0
  • D 6.0

Question 4

Question
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?
Answer
  • A π/4 rad
  • B π/2 rad
  • C 3π/4 rad
  • D π rad

Question 5

Question
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?
Answer
  • A 90°
  • B 180°
  • C 270°
  • D 360°

Question 6

Question
The diagram shows a standing wave on a string. The standing wave has three nodes N1, N2 and N3. Which statement is correct?
Answer
  • A All points on the string vibrate in phase.
  • B All points on the string vibrate with the same amplitude.
  • C Points equidistant from N2 vibrate with the same frequency and in phase.
  • D Points equidistant from N2 vibrate with the same frequency and the same amplitude.
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