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Leya [2.2K]
3 years ago
14

A semiconductor is a _____. a) crystalline solid that conducts current under any condition b) crystalline solid that conducts cu

rrent under certain conditions c) metallic solid that conducts current under any condition d) metallic solid that conducts current under certain conditions
Physics
1 answer:
max2010maxim [7]3 years ago
8 0

Explanation:

A crystalline solid that conducts current under certain conditions

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While investigating Kirchhoff's Laws, you begin observing a blackbody, such as a star, from Earth using advanced technology that
Ksenya-84 [330]

Answer:

the second time there is a gas between you and the star,

Explanation:

When you observe the star for the first time you do not have a given between you and the star, therefore you observe the emission spectrum of the same that is formed by lines of different intensity and position that indicate the type and percentage of the atoms that make up the star.

 When you observe the same phenomenon for the second time there is a gas between you and the star, this gas absorbs the wavelengths of the star that has the same energies and the atomisms and molecular gas, therefore these lines are not observed by seeing a series of dark bands,

The information obtained from the two spectra is the same, the type of atoms that make up the star

7 0
3 years ago
if the bar and block are too heavy, one of the strings may break. assuming that the two strings are identical, which one will br
DerKrebs [107]

The string that will break first depends on the weight of the block or bar subjected to such string.

According to Hook's law, the force applied to an elastic material is directly proportional to the extension of the material.

F= kx

where;

  • <em>F is the force applied to the object = weight of the object</em>

For given two identical strings, the string that will break first depends on the mass of the bar and the block.

  • If the bar is heavier than the block, then the string subjected to the bar will break first.
  • On the other hand, if the block is heavier than the bar, then the string subjected to the block will break first.

Thus, the string that will break first depends on the weight of the block or bar subjected to such string.

Learn more here:brainly.com/question/4404276

7 0
3 years ago
An object is taken from an oven at 350o F and left to cool in a room at 70o F. If the temperature fell to 250o F in one hour, wh
Oksana_A [137]

Answer:

117.83° F

Explanation:

Using Newton's Law of Cooling which can be expressed as:

\dfrac{dT}{dt}= k(T-T_1)

The differential equation can be computed as:

\dfrac{dT}{dt}= k(T-70)

\dfrac{dT}{(T-70)}= kdt

\int \dfrac{dT}{(T-70)}= \int kdt

In|T-70| = kt +C

T- 70 = e^{kt+C} \\ \\ T = 70+e^{kt+C} \\ \\ T = 70 + C_1e^{kt}  --- (1)

where;

C_1 = e^C

At the initial condition, T(0)= 350

350 = 70 C_1^{k*0}

350 -70 = C_1

280 = C_1

replacing C_1= 280 into (1)

Hence, the differential equation becomes:

T(t) = 70 + 280 e^{kt}

when;

time (t) = 1 hour

T(1) = 250

Since;

250 = 70 + 280 e^{k*1}

180 = 280e^k \\ \\ \dfrac{180}{280}= e^k

k = In (\dfrac{180}{280})

k = -0.4418

Therefore;

T(t) = 70 + 280e^{(-0.4418)}t

After 4 hours, the temperature is:

T(t) = 70 + 280e^{(-0.4418)}4

T(4) = 117.83° F

7 0
3 years ago
PLEASE PLEASE HELP ME
SVEN [57.7K]

Microwaves are one of the lowest energies on the electromagnetic spectrum. While X-Rays are one of the highest energies on the electromagnetic spectrum. One similarity is that they are both on the electromagnetic spectrum. Also they both travel at the spped of light in a vacuum. One way they are different is They have different frequencies and wavelengths. Also they are used for different studies.

8 0
3 years ago
Which elements are not likely to be formed in the sun sometime during its life cycle?
Sladkaya [172]

Answer:

correct answer is iron

Explanation:

solution

as Iron is only formed in the cores of the star that is more massive than the sun because it takes very much energy  as gravitational force push inward on the star  

and the sun can form the helium and  carbon and the oxygen and also other elements  

but not the iron or any iron group element

so correct answer is iron

8 0
3 years ago
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