The relationship between wave speed (v), frequency (f), and wavelength (λ) is given by the formula v = f × λ. Rearranging to solve for wavelength, we get λ = v / f. Substituting the given values, λ = 380 / 840 ≈ 0.452 m, which rounds to 0.45 m.
15622
What is the approximate speed of sound in air at a temperature of 0°C?
The speed of sound in dry air at 0°C (273.15 K) is experimentally determined to be approximately 331.3 meters per second. Among the provided choices, 331 meters per second is the most accurate standard value used in physics calculations for sound propagation at freezing point.
15623
Evaluate the following assertion and reason: (A) The velocity of sound in air increases with humidity. (R) Moist air has a lower density than dry air.
The speed of sound in a gas is inversely proportional to the square root of its density. Since water vapor has a lower molar mass than dry air (nitrogen and oxygen), adding moisture decreases the overall density of the air, thereby increasing the speed of sound.
15624
Which physical property determines the quality or timbre of a musical sound produced by a stringed instrument?
Timbre, or sound quality, is determined by the complex waveform of the sound. This waveform is a result of the fundamental frequency combined with various overtones and harmonics produced by the instrument. While frequency determines pitch and amplitude determines loudness, the specific distribution and intensity of these harmonics define the unique character or 'color' of the sound produced by different instruments.
15625
Evaluate the accuracy of the following statements regarding the speed of sound at 25°C: (A) The speed of sound in seawater is 1531 m/s. (B) The speed of sound in distilled water is 1498 m/s.
Experimental data confirms that the speed of sound in seawater at 25°C is approximately 1531 m/s due to higher salinity and density, while in distilled water at the same temperature, it is approximately 1498 m/s. Both values are standard physical constants used in acoustics.
15626
At what temperature will the velocity of sound in air be double its velocity at 0°C?
The velocity of sound is proportional to the square root of the absolute temperature (v ∝ √T). To double the velocity, the temperature must increase by a factor of 2 squared, which is 4. Since 0°C is 273 K, the new temperature must be 273 * 4 = 1092 K. Converting back to Celsius: 1092 - 273 = 819°C.
15627
What physical phenomenon is responsible for the occurrence of multiple or successive echoes?
An echo is produced when sound waves bounce off a surface and return to the listener. If sound waves encounter multiple reflective surfaces, such as walls or canyons, they undergo successive reflections. Each reflection can reach the observer at different times, resulting in multiple echoes being heard from a single original sound source.
15628
What term describes how the human brain perceives the frequency of a sound wave?
Pitch is the auditory sensation that allows us to order sounds on a frequency-related scale. High-frequency sounds are perceived as having a high pitch, while low-frequency sounds are perceived as having a low pitch. It is a subjective psychoacoustic attribute of sound.
15629
A marine survey vessel transmits a sound pulse to the ocean floor and detects the reflected echo after 2.5 seconds. Given that the speed of sound in seawater is 1200 m/s, what is the depth of the sea?
The sound pulse travels to the seabed and back, covering twice the depth (2d). Using the formula distance = speed × time, we have 2d = 1200 m/s × 2.5 s = 3000 m. Dividing by 2, the depth d is 1500 m.
15630
What physical phenomenon is primarily utilized by a stethoscope to transmit information to the physician?
A stethoscope functions by capturing sound waves produced by internal body organs, such as the heart or lungs. These sound vibrations are transmitted through the air column inside the rubber tubing to the earpieces. By minimizing the dispersion of these waves, the device allows the listener to hear faint internal sounds clearly, effectively acting as an acoustic amplifier.
