MCQ
A string fixed at both ends vibrates in three loops. The wave length is $10\, cm$ . The length of string is .... $cm$
- A$5$
- ✓$15$
- C$30$
- DNone
✓
Answer
Correct option: B.
$15$
b
In general, the length of string is $L = \frac{{(n - 1)\lambda }}{2}$ $n \to $ Number of loops $= $ Number of harmonics in question $n = 4 \,;\, \lambda = 10\, cm$
In general, the length of string is $L = \frac{{(n - 1)\lambda }}{2}$ $n \to $ Number of loops $= $ Number of harmonics in question $n = 4 \,;\, \lambda = 10\, cm$
$L = (4 - 1) \times \frac{{10}}{2} = 15\,cm$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
The mean free path of molecules ofa gas, (radius $r$) is inversely proportional to
→If the normal force is doubled, the coefficient of friction is
A particle of mass 1g moving with a velocity $\text{v}_1=3\hat{\text{i}}-2\hat{\text{j}}\text{ms}^{-1}$ experiences a perfectly elastic collision with another particle of mass 2g and velocity $\text{v}_2=4\hat{\text{j}}-6\hat{\text{k}}\text{ms}^{-1}$. The velocity of the particle is:
→Dimensions of stress are
Figure shows a hemispherical shell. The direction of gravitational field intensity at point $p$ will be along
→In a system of particles, internal forces can change (for the system)
Find Temperature difference between $B$ and $C$ ? (All rods are identical)
→Match list-$I$ with list-$II$:
→| List-$i$ | List-$2$ |
| $(A)$Kinetic energy of plant | $(1)$ $-\frac{\mathrm{GMm}}{\mathrm{a}}$ |
| $(B)$ Gravaitatioin potentiyal energy of sun -plant system | $(2)$ $\frac{\mathrm{GMm}}{2 \mathrm{a}}$ |
| $(C)$Total mecaniacal energy of palnt | $(3)$ $\frac{\mathrm{Gm}}{\mathrm{r}}$ |
| $(D)$Escap energyat the surface of plant for unit mass object | $(4)$ $-\frac{\mathrm{GMm}}{2 \mathrm{a}}$ |
(Where $\mathrm{a}=$ radius of planet orbit, $\mathrm{r}=$ radius of planet, $M=$ mass of Sun, $m=$ mass of planet)
Choose the correct answer from the options given below:
Consider the following two statements:
- The linear momentum of a particle is independent of the frame of reference.
- The kinetic energy of a particle is independent of the frame of reference.
- Both A and B are true.
- A is true but B is false.
- A is false but B is true.
- Both A and B are false.
A neutron exerts a force on a proton which is:
- Gravitational.
- Electromagnetic.
- Nuclear.
- Weak.