Question

The following table shows the approximate speed of sound in air, water, and steel:

Medium Speed

Air 1,100 feet per second

Water 4,900 feet per second

Steel 16,400 feet per second

In Java, write a program that asks the user to enter “air”, “water”, or “steel”, and the distance that a sound wave will travel in the medium. The program should then display the amount of

time it will take.

You can calculate the amount of time it takes sound to travel in air with the following formula:

Time = Distance / 1,100

You can calculate the amount of time it takes sound to travel in water with the following formula:

Time = Distance / 4,900

You can calculate the amount of time it takes sound to travel in steel with the following formula:

Time = Distance / 16,400

Answer 1

import java.io.*;
import java.util.*;
public class Main {
public static void main(String[] s)
{

String medium;
double distance;
double time;

Scanner choice = new Scanner(System.in);
System.out.println("Enter one of the following: air, water, or steel: ");
medium = choice.next(); // reading input i.e. air, water or steel

//check for air water and steel
if (medium.equalsIgnoreCase("air") || medium.equalsIgnoreCase("water") || medium.equalsIgnoreCase("steel")){

System.out.println("Enter the distance the sound wave will travel: ");

distance = choice.nextDouble(); // read distance value if it is air water or steel

switch (medium)
{
//if medium is air
case "air":
time = distance/1100;
System.out.print("It will take " + time + " seconds.");
break;
  
//if medium is water
case "water":
time = distance/4900;
System.out.print("It will take " + time + " seconds.");
break;
  
//if medium is steel
case "steel":
time = distance/16400;
System.out.print("It will take " + time + " seconds.");
break;
}
}
else{
System.out.print("Sorry, you must enter air, water, or steel.");   
}

}

}