Wave Motion
ICSE · Class 11 · Physics
Flashcards for Wave Motion — ICSE Class 11 Physics. Quick Q&A cards covering key concepts, definitions, and formulas.
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See them allState the meaning of a mechanical wave.
Answer
A mechanical wave is a disturbance produced in a material medium and advancing with a definite speed in the medium without changing its form. Mechanical waves transmit energy and momentum, not matter,…
Why must a mechanical wave have a medium?
Answer
Mechanical waves travel by passing disturbance from one particle of the medium to the next. This transfer needs elasticity to restore the particles and inertia to keep them moving. Without a material …
A rope carries a transverse wave with tension 100 N and mass per unit length 0.50 kg m^-1. Find the wave speed.
Answer
Given: T = 100 N, m = 0.50 kg m^-1 Formula: v = √(T/m) Step 1: T/m = 100 / 0.50 = 200 N (kg^-1 m) Step 2: v = √200 m s^-1 Step 3: v = 14.14 m s^-1 Answer: 14.1 m s^-1…
State the formula for speed of transverse wave in a solid.
Answer
Formula: v = √(η/ρ) Here, η is modulus of rigidity and ρ is density. Units: η in N m^-2, ρ in kg m^-3, so v in m s^-1. This shows that greater rigidity increases speed and greater density decreases sp…
Why do transverse waves travel in solids only, while longitudinal waves can travel in solids, liquids, and gases?
Answer
Transverse waves need shear rigidity, which is available in solids. Liquids and gases cannot sustain shear deformation for long. Longitudinal waves need compressions and rarefactions, so they can trav…
A wave on a stretched string has tension 49 N and mass per unit length 0.020 kg m^-1. Find the speed.
Answer
Given: T = 49 N, m = 0.020 kg m^-1 Formula: v = √(T/m) Step 1: T/m = 49 / 0.020 = 2450 Step 2: v = √2450 m s^-1 Step 3: v = 49.5 m s^-1 Answer: 49.5 m s^-1…
State the stress form of wave speed in a string.
Answer
Formula: v = √(stress/density) Here, stress = T/(πr^2) and density is the density of the string material. This form is useful when tension and cross-sectional area are known.
A string has stress 9.0 × 10^7 N m^-2 and density 900 kg m^-3. Find the wave speed.
Answer
Given: stress = 9.0 × 10^7 N m^-2, density = 900 kg m^-3 Formula: v = √(stress/density) Step 1: stress/density = (9.0 × 10^7) / 900 = 1.0 × 10^5 m^2 s^-2 Step 2: v = √(1.0 × 10^5) m s^-1 Step 3: v = 3…
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