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4 years ago

Science: Physics AND Biology - Please help me with these, it's due tonight.

1 answer:

7 0

The answer to the first question is that plants make glucose and oxygen by taking in CO2 and H20.

The answer to the second question is having a heavier mass increases the force of a moving object. That is the Second Law of Motion, F = ma.

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HELPPPPPP ! Pleaseeee anyone ?

kenny6666 [7]

Answer:

1 Periodic table

2 Elements

3 atomic number

4 properties

5 Periods

6 groups

7 group number

8 Valence electrons

4 0

3 years ago

Read 2 more answers

How much energy does a 75-watt light bulb consume while running for 30 minutes<br>

o-na [289]

Dont mind that guy guys

8 0

3 years ago

An object that is moving in a linear path with an acceleration in the direction opposite to the motion has a(n) ______________ v

Bas_tet [7]

An object that is moving in a linear path with an acceleration in the direction opposite to the motion has a(n) _______changing_______ velocity.

5 0

4 years ago

Two semiconductors are identical except that one has a band gap of 1.2 eV, while the other has a band gap of 1.1 eV. The room te

solong [7]

To solve this problem it is necessary to apply the relationship given by the intrinsic carrier concentration, in each of the phases.

The intrinsic carrier concentration is the number of electrons in the conduction band or the number of holes in the valence band in intrinsic material. This number of carriers depends on the band gap of the material and on the temperature of the material.

In general, this can be written mathematically as

$\eta_i = \sqrt{N_cN_v}e^{-\frac{E_g}{2KT}}$

Both are identical semiconductor but the difference is band gap which is:

$E_{g1} = 1.1eV$

$n_{i1} = 1*10^{19}m^{-3}$

$E_{g2} = 1.2eV$

$T=300K$

The ratio between the two phases are given as:

$\frac{\eta_{i1}}{\eta_{i2}} = \frac{e^{-\frac{E_{g1}}{2KT}}}{e^{-\frac{E_{g2}}{2KT}}}$

$\frac{\eta_{i1}}{\eta_{i2}} = e^{\frac{E_{g2}-E_{g1}}{2KT}}$

$\frac{\eta_{i1}}{\eta_{i2}} =e^{\frac{(1.2-1.1)(1.6*10^{-19})}{2(1.38*10^{-23})(300)}}$

$\frac{\eta_{i1}}{\eta_{i2}} =e^{-1.932367}$

$\frac{\eta_{i1}}{\eta_{i2}} =0.145$

Therefore the ratio of intrinsic carrier densities for the two materials at room temperature is 0.145

7 0

4 years ago

FM radio stations use different frequencies. For

Ratling [72]

Answer:

89.5 Hz

Explanation:

The relationship between the frequency and the wavelength is given by the following formula:

$\lambda = \frac{c}{f}\\\\$

where,

f = frequency

c = speed of light

λ = wavelength

Since the speed of light is constant. Therefore the formula suggests an inverse relationship between the frequency and the wavelength. Hence, the station with the lowest frequency will have the longest wavelength.

Therefore, the answer is:

8 0

3 years ago