Question

How long will it take for a sound wave of 25 cm wavelength and 1.5 kHz frequency of,to travel a distance of 1.5 km?​

Answer 1

Answer:

Wavelength =frequency/velocity

So here frequency = 5.0 × 1014hz

We cant convert it into m/s

Now ,

Wavelength = 5×1014/3×10^8

5070/3×10^8

1690/10^8 = 1690 × 10^-8 answer

Answer 2

$\huge \bigstar$$\huge\bold{\mathtt{\purple{✍︎A{\pink{N{\green{S{\blue{W{\red{E{\orange{R✍︎}}}}}}}}}}}}}$$\huge \Rightarrow$

$\large \bold {Given:}$

Frequency $\large (\upsilon)$ = 1.5 kHz.

= 1.5 × 10³ Hz

Wavelength $\large (\lambda)$ = 25 cm = 0.25 m.

Distance $\large (s)$ = 1.5 km = 1.5 × 10³ m

Time (t) = ?

$\Large \bold \red{Solution:}\Rightarrow$

Velocity of sound $\large \Downarrow$

$\large \Rightarrow$ v = $\upsilon\lambda$

$\large \Rightarrow$ v = 1.5 × 10³ × 0.25

$\large \Rightarrow$ v = 0.375 × 10³

$\large \Rightarrow$ v = 375 m/s

Time = $\Large \frac {Distance} {Velocity}$

t = $\Large \frac{s}{v}$=$\Large \frac{1.5×10³}{375}$ = $\Large \frac{1500}{375}$ = 4s

$\Large \bold \purple {Ans:}\Rightarrow$ The sound wave takes 4 seconds to travel distance of 1.5 Km.