The correct answer is (b) frequency. Pitch is the perception of how high or low a sound is, and it depends on the frequency of the sound wave. Higher frequency results in a higher pitch, while lower frequency produces a ...

The correct answer is (c) Wavelength. Musical sound is characterized by pitch, loudness, and quality (or timbre). Wavelength is a physical property of sound waves but is not directly considered a characteristic of musical sound perception. Class 9th Science NCERT ...

The correct answer is (b) λ. In a sound wave, one full wavelength (λ) includes a complete cycle of one compression and one rarefaction. The distance from the center of one compression to the next compression is exactly one wavelength ...

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 ...

The correct answer is (a) does not change. Potential energy depends on height (PE = mgh) and remains unchanged if the car moves on a leveled road. Only kinetic energy changes in this case, not potential energy. Class 9th Science ...

The correct answer is (c) Remains constant. When a body falls freely towards the Earth, its potential energy decreases while its kinetic energy increases. However, the total mechanical energy (sum of kinetic and potential energy) remains constant, assuming no air ...