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pishuonlain [190]
3 years ago
8

Lidia plans an experimental investigation to see how the thickness of a lens affects the point where a beam of light is focused.

She plans to shine light through a lens and measure the distance to a screen that is placed where the beam focuses.
What are the controls in Lidia’s investigation?

the material and thickness of the lens
the type of light and the material of the lens
the distance to the screen and the type of light
the thickness of the lens and the distance to the screen
Physics
1 answer:
Nostrana [21]3 years ago
4 0

Answer:

Option B

the type of light and the material of the lens

Explanation:

Since the experiment focuses on investigating how thickness of a lens affects the point where a beam of light, it means thickness of lens here are indepedent variable since Lydia has control over the thickness and can alter it. However, the point where beam of light focuses on is depedent variable since Lydia will just observe the point but can't change it. To ensure that other external factors don't affect the results, Lydia has to ensure that the type of material irrespective of thickness remain constant and also the source of light must be kept constant. Therefore, the controls will be the type of light and the material of the lens

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8 0
3 years ago
Which statements best describe science? Check all that apply. A)Science uses beliefs and opinions to construct explanations. B)S
Maru [420]

Answer:

Science is supported by facts and processes.

Science involves observation and experimentation.

Science continually changes and is constantly updated.

6 0
3 years ago
Read 2 more answers
If the relative humidity is 25 nd the saturation mixing ratio is 24g/kg, what is the mixing ratio?
levacccp [35]

The mixing ratio is 6.

To find the answer, we have to know about the mixing ratio.

<h3>What is mixing ratio?</h3>
  • The mixing ratio must be calculated in a complex manner.
  • A saturated vapor pressure (es) for values of air temperature and an actual vapor pressure (e) for values of dewpoint temperature must be determined in order to determine the mixing ratio.
  • The air temperature and/or dewpoint temperature must first be converted to degrees Celsius (°C) before the vapor pressures can be calculated.
  • The equation below can be used to determine the relative humidity (rh), as well as the actual mixing ratio and saturated mixing ratio,

                         Rh=\frac{w}{w_s} *100

where; w is the mixing ratio and w(s) is the saturation mixing ratio.

  • In our question, it is given that,

                                    Rh=25\\w_s=24

  • Thus, the mixing ratio will be,

                            w=\frac{Rh*w_s}{100} =\frac{25*24}{100}=6

Thus, we can conclude that, the mixing ratio is 6.

Learn more about mixing ratio here:

brainly.com/question/8791831

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5 0
2 years ago
If the motion of the particles in the room slow down, the temperature in the room would
Goshia [24]

Answer:

Go down

Explanation:

8 0
3 years ago
It is proposed that a spaceship might be propelled in the solar system by radiation pressure, using a large sail made of foil. W
Anvisha [2.4K]

Answer:

962291.57928 m²

Explanation:

P_r = Pressure = 2\dfrac{I}{c}  (full reflection)

I = Intensity = \dfrac{P}{A}=\dfrac{P}{4\pi r^2}

P = Power = 3.9\times 10^{26}\ W

c = Speed of light = 3\times 10^8\ m/s

M = Mass of Sun = 1.99\times 10^{30}\ kg

m = Mass of ship = 1500 kg

G = Gravitational constant = 6.67 × 10⁻¹¹ m³/kgs²

Force of radiation is given by

F_r=P_rA\\\Rightarrow F_r=2\dfrac{I}{c}\times A\\\Rightarrow F_r=2\dfrac{P}{4\pi r^2c} A

This force will balance the gravitational force as stated in the question

\dfrac{GMm}{r^2}=2\dfrac{P}{4\pi r^2c} A\\\Rightarrow A=\dfrac{4\pi cGMm}{2P}\\\Rightarrow A=\dfrac{4\times \pi\times 3\times 10^8\times 6.67\times 10^{-11}\times 1.99\times 10^{30}\times 1500}{2\times 3.9\times 10^{26}}\\\Rightarrow A=962291.57928\ m^2

The area of the must be 962291.57928 m²

3 0
3 years ago
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