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lianna [129]
3 years ago
15

The spectrophotometer measures what property of a solution? Group of answer choices

Physics
1 answer:
Yanka [14]3 years ago
5 0

Answer:

B. The ability of the solute molecules only to absorb the energy of light (photons) at a specific wavelength.

Explanation:

Spectrophotometry is the quantitative measurement of the reflection or transmission properties of a material as a function of wavelength. In case of a solution, both, solute and solvent would absorb the energy on an specific lenghtwave of light if they have a absortion coefficient diffrent of 0. The solvent could absorb energy of light, but it´s not typical, for example water does not absorb light in any lenghtwave. Therefore, for practical uses, we consider that only the solute absorbes, and it case the solvent does, that should be taken into account for the solute concentration calculation.

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The speed of an ostrich is measured to be 63 km/h. What is this speed in meters per second?
Aleksandr [31]

1 km/h = 0,277778 m/s

63 km/h = x

x= (63 × 0,277778)/ 1

x= 17.5

3 0
3 years ago
5. An infinite wire is 3.00 cm away from and parallel to a 10 cm long wire, and each has a current of 2.50 A in the same directi
Step2247 [10]

Answer:

B=1.04*10^{-4}T

Explanation:

An infinite wire produces a magnetic field that can be computed with the formula:

B=\frac{\mu_0 I}{2\pi r}

where m0 is the magnetic permeability of vacuum (4pi*10^{-7}Tm/A), I is the current of the wire (2.50A) and r is the perpendicular distance to the wire in which B is calculated (3cm=3*10^{-2}m). By replacing we obtain:

B=\frac{(4\pi*10^{-7}Tm/A)(2.50A)}{3*10^{-2}m}=1.04*10^{-4}T

hope this helps!!

3 0
3 years ago
1. While driving to Palm Desert you notice that some of the windmills near the freeway are spinning 20 times per minute. The len
igomit [66]

Answer:

a) \alpha = -0.233 rad/s^{2}

b) the rotational acceleration will remain the same,  \alpha = -0.233 rad/s^{2}

c) When r = 36 m, a_{c} = 157.25 m/s^{2}

   When r = 18 m, a_{c} = 78.63 m/s^{2}

d) When r = 36 m, a_{c} = 39.31 m/s^{2}

   When r = 36 m, a_{c} = 19.66 m/s^{2}

Explanation:

The windmills are spinning 20 times per minute, the number of spins in 1 second = 20/60  = 1/3 spins/sec

frequency, f = 1/3 spins/sec

there are 1/3 spins in 1 second,

there will be 50 spins in 50/ (1/3) seconds = 150 seconds

i.e time taken to make 50 spins = 150 seconds

Time interval between 20 and 50 spins, Δt = 150 - 60 = 90

Δt = 90

Angular frequency at 20 spins:

w₁ = 2 π f

w₁ = 2 π * 1/3 = 2π/3 = 2.09 rad/s

Since the blade stops at 50 spins, angular frequency at 50 spins, w₂ = 0

The rotational acceleration,

\alpha = \frac{\triangle w}{\triangle t} \\\alpha = \frac{w_{2} - w_{1} }{\triangle t} \\\alpha = \frac{0 - 2.09 }{90} \\\alpha = -0.233 rad/s^{2}

b) The magnitude of the rotational acceleration does not depend on the radius, r. It depends on the angular frequency, therefore the magnitude of the rotational acceleration doe not change.

c) The centripetal acceleration is given by the formula, a_{c} = w^{2} r

While the windmill spins at 20 times per minute, the angular speed gotten, w = 2.09 rad/s

When r = 36 m

a_{c} = 2.09^{2} * 36\\a_{c} = 157.25 m/s^{2}

At the halfway point, r = 18 m

a_{c} = 2.09^{2} * 18\\a_{c} = 78.63 m/s^{2}

d) If the angular velocity of the blades were cut in halves:

w = 2.09/2

w = 1.045 rad/s

When r = 36 m

a_{c} = 1.045^{2} * 36\\a_{c} = 39.31 m/s^{2}

When r = 18 m

a_{c} = 1.045^{2} * 18\\a_{c} = 19.66 m/s^{2}

8 0
3 years ago
What is the electric current if a resistance of 100 Q and voltage of 12.0 V?
sergeinik [125]
We use the formula v=ir where I is current, v is voltage, and r is resistance, we get that r=12/100 which is answer choice A
5 0
2 years ago
Read 2 more answers
Increasing the two objects will cause the gravitational force between the objects to decrease.
ELEN [110]
This statement is false. Increasing the two objects' mass (I'm guessing) will actually increase their gravitational force. This is because of the equation:

F_g =  \frac{Gm_1m_2}{d^2}

If the distance was increased, then the statement would be true, but since you are increasing mass, which is proportional to the Force of Gravity, you are in fact, increasing the gravitational force between the two objects.
4 0
3 years ago
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