Wave Interference Practice
10 problems · instant feedback · full explanations
When waves meet, displacements add. In phase = bigger wave (constructive); out of phase = cancellation (destructive). Path difference tells you which.
Q1.
What does the principle of superposition say about overlapping waves?
Multiple choice · Easy
Q2.
Two in-phase sources: at which path difference is interference fully constructive?
Multiple choice · Medium
Q3.
What phase difference between two equal waves gives complete destructive interference?
Multiple choice · Easy
Q4.
Two waves of amplitude 3 cm arrive in phase at a point. What is the resultant amplitude?
Numerical answer (cm) · Medium
Q5.
Two waves of amplitude 4 cm arrive 180° out of phase. What is the resultant amplitude?
Numerical answer (cm) · Medium
Q6.
Double-slit: λ = 500 nm, slit separation 1 mm, screen 2 m away. What is the fringe spacing? (mm)
Numerical answer (mm) · Hard
Q7.
After interfering, waves continue onward unchanged.
True / False · Easy
Q8.
Destructive interference destroys wave energy.
True / False · Medium
Q9.
An anti-reflection coating on glass should be about how thick (for wavelength λ in the coating)?
Multiple choice · Hard
Q10.
Two tuning forks at 440 Hz and 444 Hz sound together. What beat frequency is heard?
Multiple choice · Medium