The correct answer is (d) in solids, liquids as well as gases. Sound waves require a medium to propagate, as they travel by vibrating particles. They can move through solids, liquids, and gases, but not through a vacuum. Class 9th ...

The correct answer is (c) Steel. The speed of sound is highest in solids because particles are closely packed, allowing faster transmission of sound waves. In steel, sound travels much faster than in water or air. Sound cannot travel in ...

The correct answer is (a) v = vλ. The speed of sound (v) in a medium is given by the equation v = vλ, where v is the frequency and λ is the wavelength. This equation applies to all wave ...

The correct answer is (b) kinetic energy is raised to 4 times of its initial value. Kinetic energy is given by the formula KE = (1/2) m v². If the speed (v) is doubled, then KE = (1/2) m (2v)² ...

The correct answer is (a) acceleration. Both spheres experience the same acceleration due to gravity (g = 9.8 m/s²) regardless of their mass. In free fall, acceleration is independent of mass, so both spheres fall with the same acceleration. Class ...