a sound wave travels at a speed of 340m/s .if its wavelength is 2cm,what is the frequency of the wave?will it be in audible range?
Answers
λ = wave length)
v = 340
λ = 2cm = 0.02m
f = x
340 = 0.02x
x = 340/0.02
= 17000Hertz = 17kHz
Audible range = 20Hz - 20kHz
17kHz<20kHz
Therefore it in the audible range
[tex]<!DOCTYPE html>
<html lang="en">
<head>
<title>Bts army bomb</title>
</head>
<body>
<div id="container" class="army-bomb-container">
<div id="handle" class="handle">
<div id="army-bomb" class="army-bomb"/>
</div>
<style>
body {
background: linear-gradient(45deg, #FBCCB7, #EFAAC9, #CCB6D9, #A2C8ED);
width: 100vh;
height: 300px;
}
.army-bomb-container {
position: fixed;
left: 50%;
top: 50%;
transform: translateX(-50%) translateY(-30%);
}
.handle {
position: relative;
height: 200px;
width: 50px;
background-color: black;
z-index: 0;
}
/* top of the army bomb drawn using pseudo elements on the handle (so that it is drawn behind the glowing animation) */
.handle:before {
position: absolute;
left: 132.5%;
top: -30%;
width: 30px;
height: 10px;
background-color: black;
transform: rotate(45deg);
z-index: -1;
content: "";
}
.handle:after {
position: absolute;
left: 168.5%;
top: -31.5%;
width: 3px;
height: 5px;
background-color: red;
transform: rotate(45deg);
z-index: -1;
content: "";
}
.army-bomb {
position: relative;
left: 50%;
transform: translateX(-50%) translateY(-50%);
width: 150px;
height: 150px;
background-color: white;
border-radius: 75px;
animation: light-up 3s infinite ease-in-out;
}
/* BTS logo drawn using pseudo elements of the army bomb */
.army-bomb::before {
position: absolute;
top: 160%;
left: 34%;
border-bottom: 10px solid white;
border-left: 10px solid transparent;
border-right: 10px solid transparent;
height: 0;
width: 15px;
transform: rotate(90deg);
content: "";
}
.army-bomb::after {
position: absolute;
top: 160%;
right: 34%;
border-bottom: 10px solid white;
border-left: 10px solid transparent;
border-right: 10px solid transparent;
height: 0;
width: 15px;
transform: rotate(-90deg);
content: "";
}
/* glowing animation */
@keyframes light-up {
0% { box-shadow: 0px 0px 50px 1px white; }
50% { box-shadow: 0px 0px 50px 30px white; }
100% { box-shadow: 0px 0px 50px 1px white; }
}
</style>
</body>
</html>[/tex