The Question is from neet-physics waves velocity-of-sound, and it was created by the author VENKATESWARARAO

Question

A sound wave travels from air into water. Which of the following properties of the wave remains unchanged?

VENKATESWARARAO · Accepted Answer

## CORE INFORMATION
✓ **Answer**: C
## CONCEPT FRAMEWORK
 **Primary Concept**: Wave properties at a boundary
 **Related Topics**: Refraction, reflection, transmission of waves
 **Prerequisites**: Understanding of wave properties (frequency, wavelength, velocity, amplitude)
## SOLUTION PATHWAY
**Given Information**:
  A sound wave travels from air to water. This implies a change in the medium.
  The question asks which property remains unchanged.
**Method & Steps**:
 1. Consider the properties of a wave: frequency ($f$), wavelength ($\lambda$), velocity ($v$), and amplitude ($A$).
  Reasoning: When a wave passes from one medium to another, its velocity and wavelength change, but its frequency remains constant.
  Formula/Rule:  $v = f\lambda$ where $v$ is the wave velocity, $f$ is the frequency and $\lambda$ is the wavelength.
 2. Analyze the effect of the change in medium on wave properties:
  Working:  The frequency of a wave is determined by the source of the wave and does not depend on the medium.  The speed of sound is different in air and water, leading to a change in wavelength ($v = f\lambda$). The amplitude may also change, depending on the amount of reflection and transmission.
  Key Point: The frequency is an intrinsic property of the wave itself, not the medium.
 3. Identify the unchanged property:
  Result: The frequency ($f$) remains unchanged.
  Verification: Since $v = f\lambda$, if $v$ changes and $f$ remains constant, then $\lambda$ must change to maintain the equality.
 ## OPTION ANALYSIS
A :x: Wavelength changes as the speed of sound changes between air and water.
B :x: Velocity changes as the speed of sound is different in air and water.
 C ✓: Frequency remains unchanged. The frequency is determined by the source and remains constant when the wave passes through different media.
D :x: Amplitude can change due to reflection and transmission at the boundary between air and water.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing frequency with velocity or wavelength: Remember that frequency is determined by the source, while velocity depends on the medium.
  2.Assuming all properties change: Understand that some properties remain constant during wave transmission.
 **Quick Tips**:
  1.Remember the fundamental wave equation ($v = f\lambda$) to connect the different properties.
  2.Focus on the source of the wave to understand which properties are determined by the source and remain constant.

VENKATESWARARAO · Answer

Wavelength

VENKATESWARARAO · Answer

Velocity

VENKATESWARARAO · Answer

The correct Option is "Frequency"

VENKATESWARARAO · Answer

Amplitude

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