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Kruka [31]
3 years ago
6

Dylan is set to receive a football kickoff. After being kicked, the ball goes up to a height of 55m before starting back down. H

ow much time does he have before the ball comes back down?​
Physics
2 answers:
Georgia [21]3 years ago
6 0

Answer:

                   

Explanation:

 

Yanka [14]3 years ago
3 0

Answer:

There was no anwser

Explanation:

because dylan did not anwser

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What could easily be converted into heat, light, or motion? A) Steel B) Iron C) Electricity D) Energy
julia-pushkina [17]
The answer is C.energy because it can make light and heat
5 0
3 years ago
A hydrogen atom in the n=7 state decays to the n=4 state. what is the wavelength of the photon that the hydrogen atom emits? use
frez [133]

A hydrogen atom in the n=7 state decays to the n=4 state. The wavelength of the photon that the hydrogen atom emits is 4592.59nm.

The Energy of photon is the energy possessed by a photon when it moves from a high energy level to a low energy level. It emits a photon of a certain wavelength. The following relation can be used to find out the relation between the energy levels and the energy possessed:

E = 13.6 × Z² (1/n₂² - 1/n₁²) eV

where, n₁ is the initial energy level i.e. n₁ =7

            n₂ is the higher energy level i.e. n₂ = 4

            E is the energy possessed

            Z is the atomic number, Z = 1 for H-atom

Subsituting in above equation,

E = 13.6 (1/16 - 1/49) eV

E = 0.27 eV

We know that,

E = hc / λ  

where, h is Planck constant

           c is speed of light

            λ is wavelength

On subsituting,

0.27 eV = 1240/ λ

⇒ λ = 4592.59 nm

Hence, the wavelength of photon emitted by Hydrogen atom is 4592.59nm.

Learn more about Energy of Photon here, brainly.com/question/2393994

#SPJ4

 

5 0
2 years ago
What is terrestrial radiation?
Feliz [49]
C) Radiation that comes from Earth...... Hope it helps, Have a nice day :)
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Define measurements.​
Reptile [31]

Answer:

act or process of measuring

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 It bends light rays outward.<span>A concave lens causes light rays passing through to spread apart.</span>
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