Home › CBSE Class 11 › Physics › When a mechanical wave passes from one medium to…
When a mechanical wave passes from one medium to another, which quantity remains unchanged at the boundary?
AWavelength only
BFrequency only
CSpeed only
DBoth speed and wavelength
Answer & Solution
Correct answer: B. Frequency only
At a boundary, the source fixes the frequency, so frequency remains unchanged. Since wave speed generally changes with medium, the wavelength changes accordingly through $v=f\lambda$. Hence B is correct.
Related questions
A pressure gauge built from a U-shaped tube of mercury is called a:Building that indicator for a tube requires the fluid density, its viscosity, the tube radA dimensionless indicator tells an engineer whether flow will be laminar or turbulent. It Irregular streamlines that change over time indicate a flow that is:Smooth, parallel streamlines in a pipe indicate a flow that is:A measure of the internal friction inside a fluid is its:Applying conservation of energy to frictionless laminar flow links pressure with flow speeWater leaves a narrow hose nozzle much faster than it travelled in the hose. That speed-up