Download App

14. waves and sound — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics14. waves and sound1 Mark
MCQ
An organ pipe of length $L$ is open at one end and closed at other end. The wavelengths of the three lowest resonating frequencies that can be produced by this pipe are
  • A
    $4L,\,\, 2L,\,\, L$
  • B
    $2L,\,\, L,\,\, L/2$
  • C
    $2L,\,\, L,\,\, 2L/3$
  • ✓
    $4L,\,\, 4L/3,\,\, 4L/5$
✓

Answer

Correct option: D.
$4L,\,\, 4L/3,\,\, 4L/5$
d
$\mathrm{L}=(2 \mathrm{n}-1) \frac{\lambda}{4}$

$\lambda=\frac{4 \mathrm{L}}{(2 \mathrm{n}-1)} \Rightarrow \lambda_{1}=\frac{4 \mathrm{L}}{2(1)-1}=4 \mathrm{L}$

$\lambda_{2}=\frac{4 \mathrm{L}}{4-1}=\frac{4 \mathrm{L}}{3}$ and $\lambda_{3}=\frac{4 \mathrm{L}}{6-1}=\frac{4 \mathrm{L}}{5}$

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 "M.C.Q (1 Marks)" from 14. waves and sound→14. waves and sound — all question types→Physics STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

The bob of a simple pendulum of mass m and total energy $E$ will have maximum linear momentum equal to
→
The coordinates of a moving particle at any time are given by $x = a{t^2}$ and $y = b{t^2}$. The speed of the particle at any moment is
→
When a spring is stretched by $2\, cm$, it stores $100 \,J$ of energy. If it is stretched further by $2 \,cm$, the stored energy will be increased by ............. $\mathrm{J}$
→
A body of mass $400g$ connected to a spring with spring constant $10Nm^{-1}$, executes simple harmonic motion, time period of oscillation is
→
The speed of sound in any gas depends upon
→
Three blocks of masses $m_1=4 \,kg , m_2=2 \,kg , m_3=4 \,kg$ are connected with ideal strings passing over a smooth. massless pulley as shown in figure. The acceleration of blocks will be ......... $m / s ^2$ $\left(g=10 \,m / s ^2\right)$
→
For an ideal gas
→
The velocity of a particle is zero at $t = 0$.
$A.$ The acceleration at $t = 0$ must be zero.
$B.$ The acceleration at $t = 0$ may be zero.
$C.$  If the acceleration is zero from $t = 0$ to $t = 10s,$ the speed is also zero in this interval.
$D.$ If the speed is zero from $t = 0$ to $t = 10s$ the acceleration is also zero in this interval.
→
In a thermodynamic system working substance is ideal gas, its internal energy is in the form of
→
A tube-well pumps out $2400\; kg$ of water per minute. If water is coming out with a velocity of $3 \;ms ^{-1}$. How much work is done, if the pump runs for $10\; hours$?
→