Answer:
nuclear fusion
<h3>The sun generates energy from a process called nuclear fusion. During nuclear fusion, the high pressure and temperature in the sun's core cause nuclei to separate from their electrons. Hydrogen nuclei fuse to form one helium atom. During the fusion process, radiant energy is released.</h3>
Answer:
A. Theory
Explanation:
The scientific method consists of following six steps:
1. Observation 4. Prediction
2. Experiment 5. Hypothesis
3. Law 6. Theory
1. Observation:
Observations are taken carefully and systematically. In this way all possible information is gathered
about physical phenomenon.
2. Hypothesis:
Keeping these observations in mind scientist makes some postulates to explain the phenomenon. These postulates are called hypothesis.
3. Theory:
Scientist design a theory on the basis of hypothesis and gives an elaborated explanation about the phenomenon.
4. Prediction:
Sometimes a scientist presents a theory on the basis rational reasoning and predicts some phenomenon to take place under certain conditions.
5. Experiment:
The theory or prediction is tested by experiments. If the theoretical and experimental results agree with each other, the theory is accepted otherwise it is discarded.
6. Law:
A theory which is tested again and again and found to fit the facts and from which valid predictions are maybe made are known as ‘Law’.
So it is clear from the given explanation that the term, which best describes the phrase ""a description of what happens in nature" is:
<u>A. Theory</u>
Answer:
I₂ = 25 W / m²
Explanation:
Intensity is defined as the relationship between power and area
I = P / A
the power emitted by the sun is constant
P = I A
for the two points of interest
I₁ A₁ = I₂ A₂
energy is distributed on the surface of a sphere
A = 4π R²
I₁ R₁² = I₂ R₂²
I₂ =
let's calculate
I₂ =
I₂ = 25 W / m²
Answer:c
Explanation:
Given
Object moving towards the motion detector at a constant speed
Constant speed indicates that there is no acceleration .
As the object is moving in a straight line therefore its velocity is same and do not changes with time
thus the correct option is c i.e. a straight line with zero slope.
<span>The property of sound that determine its volume is its AMPLITUDE. The amplitude and the volume of the sound are directly varied. Which means that the larger the amplitude, the larger is the volume and the softer it is if the amplitude is smaller. It is not affected by the motion of the sound source so long as the barriers are not breached. </span>