5 ### Physics Concepts and Phenomena#### 5. Why is it that a very thin layer of a soap bubble (less than a wavelength of light) appears dark when viewed from above?A very thin layer of a soap bubble appears dark when it is less than the wavelength of light because of destructive interference. When light waves reflected from the top and bottom surfaces of the thin film interfere with each other, they may cancel each other out if the film thickness is such that the path difference between the two waves is a half-wavelength. This results in a dark appearance.#### 6. How does a straw work to allow a person to drink a liquid?A straw works based on the principle of pressure differential. When you suck on a straw, you decrease the air pressure inside the straw. The external air pressure, which is higher, then pushes the liquid up the straw and into your mouth. Essentially, the atmospheric pressure does the work of moving the liquid when the pressure inside the straw is reduced.#### 7. How is the change in entropy defined in thermodynamics?In thermodynamics, the change in entropy (\(\Delta S\)) is defined as the measure of the disorder or randomness in a system. For a reversible process, the change in entropy is given by:\[ \Delta S = \int \frac{dQ_{\text{rev}}}{T} \]where \(dQ_{\text{rev}}\) is the differential amount of heat added to the system reversibly, and \(T\) is the absolute temperature at which the heat is added.#### 8. Draw a diagram illustrating the Brewster's angle. Explain the physics concepts.**Brewster's Angle Diagram:**To illustrate Brewster's angle, draw a light ray incident on a surface, such as glass or water, at an angle where the reflected and refracted rays are perpendicular to each other. At this specific angle called Brewster's angle (\( \theta_B \)), the reflected light is completely polarized perpendicular to the plane of incidence.**Physics Concepts:**Brewster's angle is given by:\[ \tan(\theta_B) = \frac{n_2}{n_1} \]where \( n_2 \) is the refractive index of the medium into which the light is refracted and \( n_1 \) is the refractive index of the medium from which the light is incident. At this angle, the reflected and refr

(5) When the path length difference becomes small compared to the wavelength of the light, a phase…

B) Why is it that a very thin layer of a soap bubble (less than a wavelength of light) appears dark when viewed from above. ?. C) How does a straw work to allow a person to drink a liquid ? ) How is the change in en tropy defined in thermodynamics ? 8) Draw a diagram illustrating the Brewskr's augle. Explain the physics concepts