Supersonic speed refers to any speed that is faster than the speed of sound (Mach 1). Objects traveling at these speeds generate shock waves as they move through the medium.
15672
Which of the following statements is true / false about the speed of sound in different mediums at 25°C?A. In helium gas, the speed of sound is 965 km/s.B. In hydrogen gas, the speed of sound is 1284 m/s.
Source answer preserved: option B (Only B is true). AI attempted to change protected answer data (option_d), so this item is flagged for manual review before study use.
15673
In which of the following media is the speed of sound the highest at a temperature of 20°C?
The speed of sound depends on the elasticity and density of the medium. Sound travels faster in solids than in liquids or gases because the particles in solids are more tightly packed, allowing for more efficient transmission of mechanical vibrations. Among the choices provided, iron is a solid with a high elastic modulus, resulting in a higher speed of sound compared to water (liquid) or air (gas).
15674
What form of energy is primarily produced by the vibration of a drum's diaphragm?
When a drumhead is struck, it vibrates rapidly, causing the surrounding air molecules to oscillate. These oscillations create pressure waves that propagate through the medium as sound energy, which is perceived by the human ear as sound.
15675
Which factor primarily determines the propagation speed of sound through a medium?
The speed of sound is determined by the physical properties of the medium, specifically its elasticity (bulk modulus) and density. Sound travels faster in denser or more rigid materials, as these properties affect how efficiently mechanical energy is transferred between particles.
15676
If the time period of a sound wave is 0.01 seconds, what is its frequency in Hertz?
The frequency (f) of a wave is the reciprocal of its time period (T), expressed by the formula f = 1/T. Given T = 0.01 seconds, the calculation is f = 1 / 0.01 = 100 Hz. Thus, the wave completes 100 cycles per second.
15677
Evaluate the assertion: (A) A jet at Mach 1 travels faster at 15 km altitude than at sea level. (R) The speed of sound depends on the surrounding temperature.
The speed of sound is proportional to the square root of temperature (v ∝ √T). Since temperature decreases with altitude in the troposphere, the speed of sound is lower at 15 km than at sea level. Thus, Mach 1 (the speed of sound) is actually slower at high altitude.
15678
In which state of matter do sound waves propagate at the highest velocity?
Sound travels fastest in solids because the particles in a solid are more closely packed together than in liquids or gases. This high density and strong intermolecular forces allow mechanical vibrations to be transmitted more efficiently and rapidly between adjacent particles.
15679
Which scientific discipline is dedicated to the study of sound and its propagation?
Acoustics is the branch of physics concerned with the production, control, transmission, reception, and effects of sound. It encompasses the study of mechanical waves in gases, liquids, and solids, including vibration, sound, ultrasound, and infrasound.
15680
Which of the following is not a characteristic used to define a sound wave?
Sound waves are defined by physical parameters like amplitude, velocity, and frequency. Hertz is the SI unit used to measure frequency, not a characteristic of the wave itself. Therefore, Hertz is a unit of measurement, whereas the other options represent physical quantities that describe the wave's behavior.
