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3 years ago

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What will most likely happen if a light wave moves from the air into a solid? A) It will increase in wavelength. B) It will decr

ease in speed. C) It will increase in speed. D) It will decrease in frequency.

1 answer:

daser333 [38]3 years ago

3 0

Answer:

it will decrease speed

Explanation:

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A certain type of bird lives in two regions of a state. The distribution of weight for birds of this type in the northern region

Annette [7]

Answer: (a) Z-score are 1 and -1.2 for northern and southern regions, respectively.

Explanation: <u>Z-score</u> is how many standard deviations a data is from the population mean or how far a data point is from the mean.

The z-score is calculated by the following:

$z=\frac{x-\mu}{\sigma}$

where

x is the data point

μ is population mean

σ is standard deviation

For the <u>northern</u> <u>region</u> birds:

μ = 10, σ = 3, x = 13

$z=\frac{13-10}{3}$

z = 1

The z-score for birds living in the northern region is 1, which means it is 1 standard deviation <em>above the mean</em>.

For the southern region:

μ = 16, σ = 2.5, x = 13

$z=\frac{13-16}{2.5}$

z = -1.2

The z-score for southern living birds is -1.2, meaning it is 1.2 standard deviations <em>below the mean</em>.

6 0

3 years ago

A moon orbits a planet every 42 hours with a mean orbital radius of .002819 AU. The mass of the moon is 8.932 x 1022 kg. Using N

Pepsi [2]

Answer:

The mass of the planet is $1.9407\times10^{27}\ kg$

Explanation:

Given that,

Time period = 42 hours = 151200 sec

Orbital radius = 0.002819 AU = 421716397.5 m

Mass of moon $m=8.932\times10^{22}\ kg$

We need to calculate the mass of the planet

Using Kepler’s third law

$T^2\propto a^3$

$T^2=\dfrac{4\pi^2}{G(M+m)}\times a^3$

Where, a = orbital radius

T = time period

G = gravitational constant

M = mass of moon

m = mass of planet

Put the value into the formula

$(151200)^2=\dfrac{4\pi^2}{6.673\times10^{-11}(8.932\times10^{22}+m)}\times(421716397.5)^3$

$(8.932\times10^{22}+m)=\dfrac{4\pi^2}{6.673\times10^{-11}}\times\dfrac{(421716397.5)^3}{(151200)^2}$

$(8.932\times10^{22}+m)=1.94087\times10^{27}$

$m=1.94087\times10^{27}-8.932\times10^{22}$

$m=1.9407\times10^{27}\ kg$

Hence, The mass of the planet is $1.9407\times10^{27}\ kg$

8 0

4 years ago

with respect to air the refractive index of ice is 1.31 and that of rock salt is 1.54 calculate the refractive index of rock sal

abruzzese [7]

Answer:

1.17

Explanation:

Given that,

The refractive index of ice wrt air = 1.31

The refractive index of rock salt wrt air = 1.54

We need to find the refractive index of rock salt with respect to ice.

We know that,

refractive index = (speed of light in air or vaccum)/( speed of light in that medium)

So,

The speed of light in ice = c/(1.31)

The speed of light in rock salt = c/(1.54)

So, the refractive index of rock salt with respect to ice is :

$\mu=\dfrac{1.54}{1.31}\\\\=1.17$

So, the required refractive index of rock salt wrt ice is 1.17.

4 0

3 years ago

The wavelength of a certain portion of an electromagnetic wave is 314 nm. what is its frequency and classification?

nadezda [96]

The frequency of the electromagnetic wave is 9.55 × 1014 Hz and it is classified as ultraviolet.

<h3>What is meant by electromagnetic waves?</h3>

Electromagnetic waves are forms of energy that are invisible and travel throughout the universe. However, some of the effects of this energy are visible. The light that we see is a component of the electromagnetic spectrum.

Electromagnetic waves, or EM waves, are produced by vibrations between an electric field and a magnetic field. In other words, electromagnetic waves are made up of oscillating magnetic and electric fields.

<h3>How do you calculate the speed of an electromagnetic wave?</h3>

The wavelength and frequency of any periodic wave are used to calculate its speed. v = λf.

In free space, the speed of any electromagnetic wave is equal to the speed of light, c = 3 $*$ 108 m/s.

The frequency of the electromagnetic wave is 9.55 × 1014 Hz and it is classified as ultraviolet.

To learn more about electromagnetic wave refer to:

brainly.com/question/25847009

#SPJ4

5 0

2 years ago

A brine solution of salt flows at a constant rate of 7 L/min into a large tank that initially held 100 L of brine solution in w

larisa86 [58]

Answer:

Explanation:

Let x(t) represent the amount of salt (in kg) at any time, t (in minutes).

Step 1

Write down the input rate and output rate in terms of x (showing how you get units). What is the differential equation for x (simplified)?

Input rate: (7L/min) x (0.02kg/L) = 0.14 = 7/50

Output rate: (7L/min) (x/100 kg/L) = 7x / 100

Differential Equation: δx/δt =

=> 7/50 - 7x/100

step 2

Find the general solution for your differential equation

DE is linear with μ(t) = e^(7t/100), so solving we have

x = x(t) = e^(- 7t/100) ∫7/50 e^(- 7t/100) dt

= 50 + C e^(- 7t/100)

The initial condition mass of salt given is 0.1kg, using this we find the constant of integration

so, when t = 0, x = 0.1, therefore

0.1 = 50 + C

C = - 49.9

Hence x(t) = 50 - 49.9e^(- 7t/100)

When will the concentration of salt in the tank reach 0.01 kg/L?

concentration = 0.01kg/L

This is the same as

x/100 = 0.01

=> x = 1

Substituting x = 1 into the solution yields

1 = 50 - 49.9e^(- 7t/100)

t = 9.2486

Therefore the concentration of salt in the tank reach 0.01kg /L after 9.2486 minutes.

6 0

4 years ago