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andreyandreev [35.5K]
3 years ago
13

An example of a qualitative observation is:

Physics
1 answer:
erastova [34]3 years ago
7 0

Answer:

D

Explanation:

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Air Pressure ______ With Elevation. (A) Increases (B) Decreases (C) Does Not Change
Mnenie [13.5K]
Air pressure ''Decreases'' with Elevation. So B) would be your answer.
8 0
3 years ago
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Electrons are ejected from sodium metal by any light that has a wavelength shorter than 544 nm. What is the kinetic energy of an
wel

Answer:

KE=2.3 x 10⁻¹⁹ J

Explanation:

Given that

λ = 544 nm

λ' = 485 nm

The kinetic energy KE given as

KE= E - Ф

Where

E=\dfrac{hC}{\lambda'}

\phi=\dfrac{hC}{\lambda}

h= 6.626 x 10⁻³⁴

C=3 x 10⁸ m/s

Now by putting the values

KE=\dfrac{hC}{\lambda'}-\dfrac{hC}{\lambda}

KE=\dfrac{34.34\times 10^{-34}\times 3\times 10^8}{485\times 10^{-9}}- \dfrac{34.34\times 10^{-34}\times 3\times 10^8}{544\times 10^{-9}}

KE=2.3 x 10⁻¹⁹ J

This is kinetic energy.

6 0
3 years ago
. A student times a car traveling a distance of 2 m. She finds that it takes the car 5 s to
AveGali [126]
No, the car travels 1 metre in 5s at the start which is 0.2m/s, while the second meter it travels one metre in 8 seconds which is 0.125 m/s, the speed changes therefore it is not constant during the two metres the car travels
3 0
3 years ago
The angle of refraction rounded to the nearest whole number
Alika [10]

Answer:

15^{\circ}

Explanation:

Using Snell's law which is represented by

n_1sin\theta_1 = n_2sin\theta_2

Making \theta_2 the subject of the formula then

\theta_2=sin^{-1}(\frac {n_1sin\theta_1}{n_2})

Here \theta_1 and \theta_2 are the angles of incidence and refraction in water and air respectively

n_1 and n_2 are refraction index

Substituting 1.0003 for n_1 and 1.33 for n_2 then 20^{\circ} for \theta 1 we obtain

\theta_2=sin^{-1}(\frac {1.0003\times sin 20^{\circ}}{1.33})=14.90606875^{\circ}\approx 15^{\circ}

6 0
3 years ago
I NEED HELP PLEASE, THANKS! :)
makkiz [27]

Answer:

They move outwards.

They don't intersect each other at any point.

They show the electric field.

Explanation:

8 0
3 years ago
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