Answer:
5.03 m
Explanation:
The wavelength of a wave is given by
![\lambda=\frac{v}{f}](https://tex.z-dn.net/?f=%5Clambda%3D%5Cfrac%7Bv%7D%7Bf%7D)
where
v is the speed of the wave
f is the frequency of the wave
For the sonar signal in this problem,
![f=288 Hz](https://tex.z-dn.net/?f=f%3D288%20Hz)
![v=1.45\cdot 10^3 m/s](https://tex.z-dn.net/?f=v%3D1.45%5Ccdot%2010%5E3%20m%2Fs)
Substituting into the equation, we find the wavelength:
![\lambda=\frac{1.45\cdot 10^3 m/s}{288 Hz}=5.03 m](https://tex.z-dn.net/?f=%5Clambda%3D%5Cfrac%7B1.45%5Ccdot%2010%5E3%20m%2Fs%7D%7B288%20Hz%7D%3D5.03%20m)
"The sound waves diffract much more than the light waves so try bend and spread as they move through the doorway" and this is why it is possible that you can hear the sound of the movie or play even if you <span>cannot see the screen or stage. The correct option among all the options given in the question is option "D".</span>
Answer:
The process by which the balloon is attracted and possibly sticks to the wall is known as static electricity which is the attraction or repulsion between electric charges which are not free to move.
The wall is an insulator.
Explanation:
When a balloon is blown and tied off, and then the balloon is rubbed on the woolly object once in one direction, and the side that was rubbed against the wool is brought near a wall and then released, it is observed that the balloon is attracted to and sticks to the wall. The above observation is due to static electricity.
Static electricity refers to electric charges that are not free to move or that are static. One of the means of generating such charges is by friction. When the balloon is rubbed on the woollen material, electrons are given away to the balloon's surface. Since the balloon is an insulator (materials which do not allow electricity to pass through them easily), the electrons are not free to move. When the balloon is brought near to a wall, there is a rearrangement of the charges present on the wall. Negative charges on the wall move farther away while the positive charges on the wall are attracted to the electrons on the balloon's surface. Because the wall is also an insulator, the charges are not discharged immediately. Therefore, this attraction between opposite charges as well as the static nature of the charges results in the balloon sticking to the wall.