Download App

Wave Motion and Waves on a String — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysicsWave Motion and Waves on a String2 Marks
Question
In the arrangement shown in figure, the string has a mass of $4.5g$. How much time will it take for a transverse disturbance produced at the floor to reach the pulley? Take $g = 10m/s^2$.
✓

Answer



Total length of string $2+0.25=2.25\text{mt}$
Mass per unit length $\text{m}=\frac{4.5\times10^{-3}}{2.25}=2\times10^{-3}\text{kg/m}$
$\text{T}=2\text{g}=20\text{N}$
Wave speed,
$\text{v}=\sqrt{\Big(\frac{\text{T}}{\text{m}}\Big)}=\sqrt{\frac{20}{(2\times10^{-3})}}=\sqrt{10^4}=10^2\text{m/s}=100\text{m/s}$
Time taken to reach the pully, $\text{t}=\Big(\frac{\text{s}}{\text{v}}\Big)=\frac{2}{100}=0.02\text{sec}.$

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 "2 Marks Questions" from Wave Motion and Waves on a String→Wave Motion and Waves on a String — all question types→Physics STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

Rain is falling vertically with a speed of $35 m s ^{-1}$. Winds starts blowing after sometime with a speed of $12 m s ^{-1}$ in east to west direction. In which direction should a boy waiting at a bus stop hold his umbrella?
Image
→
An inductor-coil carries a steady-state current of 2.0A when connected across an ideal battery of emf 4.0V. If its inductance is 1.0H, find the time constant of the circuit.
→
Block A of weight 100N rests on a frictionless inclined plane of slope angle 30° A flexible cord attached to A passes over a frictonless pulley and is connected to block B of weight W. Find the weight W for which the system is in equilibrium.
→
A pan filled with hot food cools from $94^{\circ}\text C $ to $86^{\circ}\text C $ is 2 minutes when the room temperature is at $20^{\circ}\text C $. How long will it take to cool from $71^{\circ}\text C $ to $69^{\circ}\text C $?
→
Taking force, length and time to be the fundamental quantities find the dimensions of:
  1. Density.
  2. Pressure.
  3. Momentum.
  4. Energy.
→
Shows plot of $\frac{P V}{T}$ versus $P$ for $1.00 \times 10^{-3} \mathrm{~kg}$ of oxygen gas at two different temperatures: Which is true, $T_1>T_2$ or $T_1$ $<T_2$ ?
→
Can you add two vectors representing physical quantities having different dimensions? Can you multiply two vectors representing physical quantities having different dimensions?
→
A body starts from rest and moves along a straight line. It has uniformly accelerated motion upto time $t_1$. During the interval $t_2-t_1$ it moves with uniform velocity. After time $t_2$ its motion is retarded, and it comes to rest at time $t_3$. Draw the velocity-time graph.
→
What are co-initial and collinear vectors?
→
Two waves of equal frequencies have their amplitudes in the ratio of $3: 5$. They are superimposed on each other. Calculate the ratio of $I _{\text {max }} / I _{\text {min }}$.
→