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3 years ago

. What is the relationship between frequency, wavelength and speed of a wave?

Computers and Technology

1 answer:

jeka943 years ago

5 0

Answer:

vw = fλ

Explanation:

Sound, like all waves, travels at a certain speed and has the properties of frequency and wavelength. You can observe direct evidence of the speed of sound while watching a fireworks display. The flash of an explosion is seen well before its sound is heard, implying both that sound travels at a finite speed and that it is much slower than light. You can also directly sense the frequency of a sound. Perception of frequency is called pitch. The wavelength of sound is not directly sensed, but indirect evidence is found in the correlation of the size of musical instruments with their pitch. Small instruments, such as a piccolo, typically make high-pitch sounds, while large instruments, such as a tuba, typically make low-pitch sounds. High pitch means small wavelength, and the size of a musical instrument is directly related to the wavelengths of sound it produces. So a small instrument creates short-wavelength sounds. Similar arguments hold that a large instrument creates long-wavelength sounds.

The relationship of the speed of sound, its frequency, and wavelength is the same as for all waves: vw = fλ, where vw is the speed of sound, f is its frequency, and λ is its wavelength. The wavelength of a sound is the distance between adjacent identical parts of a wave—for example, between adjacent compressions as illustrated in Figure 2. The frequency is the same as that of the source and is the number of waves that pass a point per unit time.

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Using the program below, explain what the output will be at LINE A. 1 #include 2#include 3#include 4 5 int value - 128; 6 7 int

slega [8]

Answer:

This is the complete correct program:

#include <stdio.h>

#include<sys/types.h>

#include<unistd.h>

int value = 128;

int main()

{

pid_t pid;

pid=fork();

if (pid==0) /* child process */

{

value +=8;

return 0; }

else if (pid > 0) {/* parent process */

wait (NULL);

printf ("PARENT: value =%d\n" ,value); /* LINEA */

return 0;

}

The output of the LINE A is:

PARENT: value = 128

Explanation:

The fork() function used in the program creates a new process and this process is the child process. The child process is same as the original process having its own address space or memory.

In the child process the value of pid is 0. So the if condition checks if pid==0. Then the child process adds 8 to the value of its variable according to the following statement

value +=8;

Now the original process has value = 128. In else if part the parents process has the value of pid greater than zero and this portion of the program is of the parent process :

else if (pid > 0)

{ wait (NULL);

printf ("PARENT: value =%d\n" ,value);

return 0; }

So the value 128 is printed at the end in the output.

wait(NULL) is used to wait for the child process to terminate so the parent process waits untill child process completes.

So the conclusion is that even if the value of the variable pid is changed in the child process but it will not affect the value in the variable of the parent process.

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3 years ago

Did the Z3 computer invented by Konrad Zuse have a negative effect on society?

musickatia [10]

Answer:

Explanation:

Không

4 0

2 years ago

Read 2 more answers

Write a program that reads a 4-bit binary number from the keyboard as a string and then converts it into decimal. For example, i

adell [148]

Answer:

import java.util.Scanner;

public class ss11{

public static void main (String[]args) {

Scanner keyboard = new Scanner (System.in)

String a1, a2, a3, a4, a5;

int i1, i2, i3, i4, i5;

System.out.println("Enter a four bit binary number:");

a1= keyboard.next();

a2= a1.substring(0,1);

a3= a1.substring(1,2);

a4= a1.substring(2,3);

a5= a1.substring(3,4);

i1 = Integer.parseInt(a2);

i2 = Integer.parseInt(a3);

i3 = Integer.parseInt(a4);

i4 = Integer.parseInt(a5);

i1= i1 * 8;

i2= i1 * 4;

i3= i1 * 2;

i4= i1 * 1;

i5= i1+i2+i3+i4;

System.out.println("The converted decimal number is: +i5);

}

Explanation:

7 0

3 years ago

two Smallest (10 points). Write a program TwoSmallest.java that takes a set of double command-line arguments and prints the smal

Umnica [9.8K]

Answer:

Below is the program TwoSmallest.java with each step explanation in form of comments.

public class TwoSmallest { // class definition

//main class having string args as a parameter

public static void main(String[] args)

{ if (args.length < 2)

{ //string length must not be less than 2 for proceeding

System.out.println("Please provide double values as command line arguments");

}

else {

// first two entries of string are checked for min1 and min2 and stored in variables with data type double

double min1 = Double.parseDouble(args[0]), min2 = Double.parseDouble(args[1]), num;

//when min1 will be greater than min2 it will be stored temporary in variable temp having data type double

if (min1 > min2) {

double temp = min1;

min1 = min2;

min2 = temp; //value of temp will be stored in min2

}

//loop will check for each entry remaining until the last character of string

for (int i = 2; i < args.length; i++) {

num = Double.parseDouble(args[i]);

if (num < min1) {

min2 = min1;

min1 = num;

} else if (num < min2) {

min2 = num;

}

//min1 will give the 1st minimum number and min2 will give 2nd minimum.

System.out.println(min1);

System.out.println(min2);

//both characters will be printed in sequence

}

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3 years ago

Which of these is not part of a consumer profile??

matrenka [14]

Which of what? What is the complete question???

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3 years ago