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ANEK [815]
2 years ago
6

Tera performed multiple experiments to determine the best growing conditions for Azaleas. In one experiment, she tested the effe

ct of using different types of soil. In another experiment, she tested the effect of exposing the plants to varying amounts of light. And, in another experiment, she tested the use of different amounts of fertilizer. Once she completed her experiments, Tera recorded all of her observations before making a conclusion.
This scenario suggests that

A.scientific questions are often solved by performing a single experiment
B.scientific hypotheses should be made after reaching a conclusion.
C.scientific evidence includes observations, data, and personal opinions
D.scientific explanations are based on evidence, or data.


I think its D
Physics
2 answers:
Ira Lisetskai [31]2 years ago
8 0
The answer should be D. Ur right
Talja [164]2 years ago
8 0

Answer:

Option D. The scenario suggests that scientific explanations are based on evidence, or data.

Explanation:

Before making a conclussion or giving an explanation on the experiment made, Tera performs mutiple experiments with different variables and then records all of the obserations made during the experiments, to be able to make a conclussion. This suggests that scientific explanations come as a result of evidence or data, as Tera's recorded observations will show.

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The oscillating electric field in a plane electromagnetic wave is given by <img src="https://tex.z-dn.net/?f=%7B50%5Csin%20%28%5
Scorpion4ik [409]

Here, we are given with:

{:\implies \quad \longrightarrow \begin{cases}\sf E_{0}= 50\: V/m\\ \sf \nu = 2\times 10^{7}Hz\end{cases}}

(a) So now, we can thus obtain

{:\implies \quad \sf \omega =2\pi \nu}

{:\implies \quad \sf \omega =2\pi (2\times 10^{7})}

{:\implies \quad \boxed{\bf{\omega = 4\pi \times 10^{7}\: s^{-1}}}}

Now, finding \lambda

{:\implies \quad \sf \lambda =\dfrac{c}{\omega}=\dfrac{3\times 10^{8}}{4\pi \times 10^{7}}}

{:\implies \quad \boxed{\bf{\lambda \approx 2.39\:m}}}

Now, finding k

{:\implies \quad \sf k=\dfrac{2\pi}{\lambda}=\dfrac{200\pi}{239}}

{:\implies \quad \boxed{\bf{k\approx 2.63\:m^{-1}}}}

Thus, expression for the electric field is:

{:\implies \quad \boxed{\bf{E=50\sin \bigg(4\pi \times 10^{7}t-\dfrac{263x}{100}\bigg)}}}

(b) Now, here

{:\implies \quad \sf B_{0}=\dfrac{E_{0}}{c}=\dfrac{50}{3\times 10^{8}}}

{:\implies \quad \boxed{\bf{B_{0}\approx 16.67×10^{-7}\:T}}}

Thus, expression for the magnetic field:

{:\implies \quad \boxed{\bf{B_{y}=16.67\times 10^{-7}\sin \bigg(4\pi \times 10^{7}t-\dfrac{263x}{100}\bigg)\:T}}}

(c) The electromagnetic wave propagates along Z-axis

4 0
2 years ago
How do you find potienal energy
pogonyaev
For the gravitational force the formula is P.E. = mgh, where m is the mass in kilograms, g is the acceleration due to gravity <span>and h is the height in meters.Watch that gravitational </span>potential energy<span> has the same units as kinetic </span>energy.
3 0
3 years ago
How do you get 5 minutes to seconds
sergiy2304 [10]
There are 60 seconds in a minute.

This means that 5 minutes would be 60 times 5.
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There are 300 seconds in 5 minutes.
5 0
3 years ago
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Suppose you monitor a large number (many thousands) of stars over a period of 3 years, searching for planets through the transit
nasty-shy [4]

Answer:

2. You must be able to precisely measure variations in the star's brightness with time.

5. As seen from Earth, the planet's orbit must be seen nearly edge–on (in the plane of our line-of-sight).

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Explanation:

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2. The brightness of the star must be observed precisely as the period of transit can be less than a second as seen from Earth. Also the dip in brightness depends on the size of the planet. If the planet is not that big the intensity dip will be very less.

3. The spectrum of the star needs to be studied and observe during the transit and normally to find out the details about the planets.

4. Also, the orbital period should be less than the period of observation for the transit to occur at least once.

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Answer:

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Explanation:

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