Sound is a mechanical wave that requires a material medium to propagate. Since the Moon has no atmosphere (a vacuum), sound waves cannot travel through space to reach Earth, making it impossible to hear the explosion.
15442
Which of the following factors influence the velocity of sound propagation through air?
The speed of sound in air depends on temperature, humidity (moisture content), and the composition of the gas mixture. Atmospheric pressure does not significantly affect the speed of sound in an ideal gas because density and pressure changes cancel each other out.
15443
Evaluate the following: 1. A shorter flute produces lower frequency waves. 2. Sound propagates through rocks as longitudinal elastic waves.
Statement 1 is incorrect because a shorter air column in a flute results in a higher frequency. Statement 2 is correct as sound waves in solids, including rocks, propagate primarily as longitudinal waves due to the material's elasticity.
15444
Given Va, Vw, and Vs represent the speed of sound in air, water, and steel respectively, which inequality correctly compares them?
The speed of sound depends on the density and elasticity of the medium. Sound generally travels fastest in solids (steel), followed by liquids (water), and slowest in gases (air). Thus, Va < Vw < Vs.
15445
Which characteristic of a sound wave is primarily responsible for determining its pitch?
Pitch is the human perception of the frequency of a sound wave. Higher frequencies correspond to higher pitches, while lower frequencies correspond to lower pitches. Amplitude is related to the intensity or loudness of the sound, not the pitch. Frequency is defined as the number of cycles per unit of time, which directly dictates the perceived musical tone.
15446
Why does a large drum produce a louder sound compared to a smaller drum?
Loudness is related to the amplitude of vibration and the surface area of the vibrating object. A larger drum has a greater surface area, which allows it to displace more air molecules during vibration, resulting in a more intense sound wave compared to a smaller drum.
15447
Which of the following statements regarding sound waves is scientifically incorrect?
Sound waves with frequencies below 20 Hz are classified as infrasonic, not ultrasonic. Ultrasonic waves refer to sound frequencies above the human audible range, typically exceeding 20,000 Hz. Therefore, statement B is factually incorrect.
15448
What term describes speeds that exceed the speed of sound in air?
Supersonic speed refers to any speed that is greater than the speed of sound in the surrounding medium. When an object travels at these speeds, it creates shock waves as it outruns the sound waves it produces.
15449
What is the approximate speed of sound in air at standard conditions?
The speed of sound in air depends on temperature and atmospheric conditions. At room temperature (approximately 20°C), the speed of sound is roughly 343 m/s, while at 0°C, it is approximately 331 m/s. Among the provided choices, 330 m/s is the standard accepted approximation for the speed of sound in air under typical conditions, distinguishing it from the speed of light (3 × 10^8 m/s).
15450
Evaluate the assertion and reason: Assertion (A): Reverberation is primarily noticeable in large buildings such as churches. Reason (R): The walls, roof, and ground surfaces can cause multiple reflections of sound.
Reverberation is the persistence of sound in a space after the original source has stopped, caused by multiple reflections from surfaces. In large buildings, the distance between surfaces allows for a longer time delay between reflections, making the effect more pronounced and audible to the human ear.
