- ACircular orbits around the sun
- BElliptical orbits around the sun with sun at exact centre
- CStraight lines with constant velocity
- ✓Elliptical orbits around the sun with sun at one of its foci
Kepler's first law,
Law of Orbits : All planets move in elliptical orbits, with the surn at one of the foci of the ellipse.
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$(A)$ With a node at $O$, the minimum frequency of vibration of the composite string is $v_0$
$(B)$ With an antinode at $O$, the minimum frequency of vibration of the composite string is $2 v_0$
$(C)$ When the composite string vibrates at the minimum frequency with a node at $O$, it has $6$ nodes, including the end nodes
$(D)$ No vibrational mode with an antinode at $O$ is possible for the composite string
$\text{v}_\text{A}>\text{v}_\text{B}>\text{v}_\text{C}.$
$\text{v}_\text{A}<\text{v}_\text{B}<\text{v}_\text{C}$
$\text{v}_\text{A}=\text{v}_\text{B}=\text{v}_\text{C}$
$\text{v}_\text{B}=\frac{1}{2}(\text{v}_\text{A}+\text{v}_\text{C})$