Physics make-up packetname_cle14. an observer hears a sound with a frequency of 400 hz. if the speed of sound is 340 m/s, what is the wavelength of the sound? a. 0.85 mb. 1.2 mc. 2.75 m13.6 m15. as sound travels from steel into air, its speed decreases. if the frequency of the wavedoesn't change, what happens to its wavelength? a. it increases(b) it decreasesc. it remains the samed. there is not enough information given
The correct answer is option(A).
Sound travels fast in air , faster in liquid and fastest in solids.
This is because the particles in solid state are tightly packed by which no collisions between particles are present unlike in liquids and gases.
In gases, particles are far apart due to which particles are free to collide which each other. Due to these collisions the speed of sounds slows down in the gaseous state.
According to question the speed of the sound in water will increase on freezing because state of water is changing into solid state from liquid state. And sounds travels fastest is solid state of matter which means that speed will increase on solidification.
Hence, correct answer is option A.