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AQA - A Level Physics - Waves #2

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Quiz by Nighthawk
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Last updated: July 8, 2020
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First submittedJuly 8, 2020
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Hint
Answer
Define node
A point where the waves are in antiphase and destructively interefere
Define antinode
A point where the waves are in phase and constructively interfere
What occurs where a node is produced
Destructive interference
What occurs where an antinode is produced
Constructive interference
Give 3 factors that determine the 1st harmonic on a string
Length, tension and mass per unit length
What is L in f = (1/2L)×√(T/µ)
Length of the string (m)
What does the loudness of a sound depend on?
Depends on the amplitude of a sound wave
What is the phase difference between points either side of a node?
Pi radians
Hint
Answer
Phase difference of all points between two adjacent nodes
Zero
What does the pitch produced by a string depend on?
Depends on the frequency of the 1st harmonic
What is T in f = (1/2L)×√(T/µ)
Tension in the string (N)
Why can only certain frequency standing waves be produced on strings?
The must be nodes at the fixed ends and only certain frequencies/wavelengths allow this.
What is the angle of refraction at the critical angle
90 degrees
What are the conditions required for total internal reflection
The second medium has a lower refractive than the first. The angle of incidence is greater than the critical angle.
Definition of the refractive index of a material
n = c/v Speed of light in a vacuum/Speed of light in material
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