The loudness or softness of a sound is basically determined by its

RRB Nsg. Superintendent-20 July 2019 (Shift-3rd)

General Knowledge

Easy

Appeared in: RRB Nsg. Superintendent-20 July 2019 (Shift-3rd)

Explanation

The loudness of a sound is the human perception of its intensity.
The physical property that determines sound intensity is its amplitude, which is the maximum displacement or pressure variation of the wave.
A sound wave with a larger amplitude carries more energy and is perceived as louder.
Conversely, a sound wave with a smaller amplitude carries less energy and is perceived as softer or quieter.

Option A: Phase describes the position of a point within a wave's cycle relative to a starting point. It affects how waves interact but does not determine the loudness of a single wave.
Option B: The time period is the duration of one complete wave cycle. It is the inverse of frequency and is directly related to the pitch (how high or low the sound is), not its loudness.
Option D: Oscillation is the general term for the repetitive vibration that produces the sound wave. It is the process of creating the wave, not a measurable property that determines its loudness.

Visual 1: Diagram - A diagram comparing two sound waves. One wave has a high amplitude and is labeled 'Loud Sound.' The other wave has a low amplitude and is labeled 'Soft Sound.' Both waves can have the same frequency to isolate the concept of amplitude.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Physics of Sound Waves as background academic context rather than a clinical decision trigger.
Understanding sound properties is crucial for clinical skills like auscultation. The loudness (amplitude) of heart murmurs, for example, is graded on a scale (e.g., 1/6 to 6/6) and is a key factor in diagnosis and assessing severity.
The concept is also fundamental to medical technologies like Doppler ultrasound, which uses the properties of sound waves to visualize blood flow and organ function.
What if the question was about pitch? If the question asked what determines if a sound is high or low, the correct answer would be related to frequency (the inverse of the time period), not amplitude.

How to Approach the Question

First, identify the core concept in the question. The question asks about the physical property that determines 'loudness or softness.'
Recall the basic physics of sound waves. Sound has three main perceptual characteristics: loudness, pitch, and timbre.
Match the perceptual characteristic (loudness) to its corresponding physical property.
Remember the key relationship: Amplitude corresponds to Loudness, and Frequency corresponds to Pitch.
Evaluate the given options. 'Amplitude' is listed as an option.
Eliminate the other options by defining them: 'Phase' relates to wave interaction, 'Time period' relates to pitch, and 'Oscillation' is the process of wave creation.

Concept Tested & Keywords

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