There are multiple devices that emit radio waves. The most obvious is are radiod and microwaves (yes, the food cooker). Wireless applicances also emit radio waves. But don't confuse everything to use microwaves. Some applicances use frequencies instead of radio waves. Some applicances that use frequencies are toy control remotes and a garage door.
I hope this helps! Please make sure ask me if you need more clarity!
        
             
        
        
        
Answer:
format
alignment
excel
=
Explanation: i'm an accountant
 
        
             
        
        
        
Answer:
the answer would be B proxy server
 
        
             
        
        
        
Answer:
The output of the given code as follows:
Output:
Area is: 12.60676
Explanation:
In the given code some information is missing so, the correct code to this question can be described as follows:
Program:
public class Test //defining class  
{
    public static void main(String[] args)//defining the main method
    {
        double radius= 2; //defining double variable radius
        final double PI= 3.15169; //defining double variable PI
        double area = radius * radius * PI; //defining double variable area that calculates values
        System.out.println("Area is: " + area); //print values
    }  
}
Explanation:
- In the given java code a class "Test" is defined, in which a double variable "radius" is defined, which holds a value, that is 2.
- In the next step, a double constant variable, that is PI is defined, that holds a value, that is "3.15169".
- Then another double variable area is defined, that calculates the area value, and prints its value.