Overlapping pulses
Displacements +6 mm and −9 mm overlap. Find the resultant and describe the later pulses.
STRUCTURED PRACTICE
Superposition
Attempt each visible question before revealing support.
Interference condition
Classify path difference 7λ/2 for equal coherent sources.
Two-source point
Paths to P are 1.84 m and 2.08 m for λ = 0.16 m. Classify P.
Stationary pattern
A string has adjacent nodes 0.18 m apart. Find λ. State the phase of adjacent loops.
Second harmonic
A 0.75 m string has wave speed 120 m s⁻¹. Find the second-harmonic frequency.
Diffraction comparison
Explain why 2 cm water waves spread more through a 3 cm gap than a 15 cm gap.
Double-slit wavelength
w = 3.0 mm, D = 1.8 m and a = 0.36 mm. Find λ.
Highest grating order
A grating has 400 lines mm⁻¹ and λ = 600 nm. Find the highest possible order.