Answer:
hello your question has some missing parts below is the complete question
and the missing diagram
The two speakers emit sound that is 180° out of phase and of a single frequency,ƒ, Find the lowest two frequencies that produce a maximum sound intensity at the positions of Moe and Curly.
answer : 1316.2 hertz
Explanation:
The frequency that produce the maximum sound intensity can be calculated using the relation below
dsin ∅ = n <em>A</em>
where <em>A = </em>dsin ∅ / n when n = 1 . d = 0.800
<em>A</em> = 0.800 * ( 1 / 3.162 )
<em>A</em> = 0.253 m
speed of sound = 333 m/s
frequency = speed /<em> A</em>
<em>= </em>333 / 0.253 = 1316.2 hertz
Answer:
12 cm
Explanation:
Mirrors work on the principle of reflection.
Reflection occurs when a ray of light bounces off a surface, being reflecting back into the original medium.
Mirrors are surfaces over which light is reflected; as a result, objects placed in front of a mirror produce an image of themselves.
There are two types of mirrors:
- Curved mirrors: this mirrors are curved, and are further divided into convex mirrors and concave mirrors. These mirrors can produce images that are real or virtual, bigger or smaller tha the original objects, and also upright or inverted, depending on the position of the object with respect to the mirror
- Flat mirrors: these mirrors are perfectly flat. The image produced by a flat mirror is:
- The same size as the object
- Laterally inverted
- Upright
- At the same distance as the object from the mirror (4)
- Virtual (it appears "behind" the mirror)
In this problem, the object is located 12 cm in front of the mirror. According to statement (4), the image produced by a flat mirror is at the same distance as the object: therefore in this case, it is 12 cm.
<span>So we want to know what is not true for the following statements about solar energy. It is true that it is used to sail ships. It is true that is not reliable. It is true that windmills are used to provide energy from wind. But it is not true that wind energy is a nonrenewable energy resource. So the correct answer is a. </span>