Download App

Waves — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysicsWaves1 Mark
Question
The pattern of standing waves formed on a stretched string at two instants of time are shown in The velocity of two waves superimposing to form stationary waves is $360ms^{–1}$ and their frequencies are $256Hz$
  1. Calculate the time at which the second curve is plotted.
  2. Mark nodes and antinodes on the curve.
  3. Calculate the distance between A′ and C′.
✓

Answer

Given frequency of the wave v = 256Hz$\therefore\text{T}=\frac{1}{\text{v}}=\frac{1}{256}$ second = 0.00390
$\text{T}=3.9\times10^{-3}$ seconds.
(a) In stationary wave a particle passes though it's mean position after ever $\frac{\text{T}}{4}$ time$\therefore$ in II nd curve displacement of all medium particle, are zero so
$\text{t}=\frac{\text{T}}{4}=\frac{3.9\times10^{-3}}{4}=.975\times10^{-3}\sec$
$\text{t}=9.8\times10^{-4}$ secound.
(b) Point does not vibrate i.t., their displacement is zero always so nodes A, B, C, D and E. the point A' and C' are at maximam displacement so there are anti-nodes at A' and C'. Between A' and C' $=\lambda=\frac{\text{v}}{\text{V}}=\frac{360}{256}=\frac{90}{64}=1.41\text{m}.$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "1 Marks Question" from Waves→Waves — all question types→Physics STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

An astronaut accidentally gets separated out of his small spaceship accelerating in inter stellar space at a constant rate of $100 m s ^{-2}$. What is the acceleration of the astronaut the instant after he is outside the spaceship ? (Assume that there are no nearby stars to exert gravitational force on him.)
→
Draw a diagram to show all the forces acting on a tanga-horse earth system and mark the action- reaction pairs in them.
→
Find the increase in pressure required to decrease the volume of a water sample by 0.01%. Bulk modulus of water = $2.1 \times 10^9N/m^2$.
→
What is atomic mass unit (a.m.u.)?
→
A rifle barrel has a spiral groove which imparts spin to the bullet. Why?
→
Can we decide whether change in internal energy of a system is due to heating or performance of work?
→
Two gases are at the same temperature, can we conclude that the r.m.s. of gas molecules? Will the velocities be the same? Why?
→
Write two essential properties of an ideal heat engine.
→
Read each statement below carefully and state, with reasons, if it is true or false: The velocity vector of a particle at a point is always along the tangent to the path of the particle at that point.
→
Do rain drops fall with uniform velocity or with uniform acceleration?
→