The distinction lies in the fact that the candle emits an emission spectrum, while the book reflects an absorption spectrum. In the case of the book, light is observed from all directions, causing its reflection to be diffuse. Explanation: The light emitted by a candle originates from the heat of the flame, composed of a combination of emissions from a black body at that temperature along with emissions from the chemical elements within the candle. On the contrary, the light reflected off a book cover consists of the incident light spectrum minus the wavelengths that trigger electronic transitions in the cover's elements, resulting in dark areas on the spectrum. Consequently, the difference stems from the candle producing an emission spectrum, whereas the book showcases an absorption spectrum. For a book's cover to reflect light specularly, incident rays would need to reflect uniformly, creating dark areas. However, since light is observed from all directions when reflecting off a book, the result is diffuse reflection.
Answer:
b. 9.5°C
Explanation:
= Ice mass = 50 g
= Initial temperature of water and aluminum = 30°C
= Latent heat of fusion = 
= Water mass = 200 g
= Water's specific heat = 4186 J/kg⋅°C
= Aluminum mass = 80 g
= Aluminum's specific heat = 900 J/kg⋅°C
The equation governing heat exchange in the system is presented by
The final equilibrium temperature calculates to 9.50022°C
Answer:
Refer to the explanation.
Explanation:
To grasp the concept, start with the fundamental idea of meniscus in a graduated cylinder.
"The meniscus refers to the curve noticed at the surface of a liquid due to its container. Depending on liquid surface tension and its adherence to the container’s walls, this meniscus may be concave or convex".
Given this definition, when measuring the volume of water, it's crucial to read the measurement at the bottom of the meniscus curve, as water forms a concave shape.
Taking the reading at eye level ensures an accurate volume, as it aligns with this method.
Additionally, this way of reading balances total pressure with atmospheric pressure by adjusting the cylinder's height to match the water level.
d. at the same velocity. Explanation: I'll assume the car is also moving west since the helicopter is stated to be above it. From the perspective of someone in the car, the helicopter will appear stationary as they share the same velocity. Viewed from along the roadside, both are traveling at the same speed. Remember that velocity is a vector quantity, which includes direction, while speed measures the rate at which an object covers distance without direction. Hence, velocity is the appropriate term here.
