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3 years ago

Are aliens real in 2020

Physics

2 answers:

Eddi Din [679]3 years ago

8 0

Answer:

i believe that they are or there's something out there

Explanation:

e-lub [12.9K]3 years ago

6 0

Yes, they look exactly like newborn babies

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Electricity and magnetism are? Regulated by one force with positive and negative charges Two separate forces Both of the above

Anarel [89]

Answer:

two separate forces

Explanation:

Electricity and magnetism are two separate forces. However, they come together in a field called electromagnetism. Both types of forces are linked; a moving magnet may push electric charges and trigger electric current. Objects which have both positive and negative charges are mutually repulsive to each other, and those with opposite charges are mutually attractive.

5 0

3 years ago

what is the energy (in eV units) carried by one photon violet light that has a wavelength of 4.5e-7?

DaniilM [7]

The energy of a photon is given by
$E=hf$
where h is the Planck constant and f is the photon frequency.

We can find the photon's frequency by using the following relationship:
$f= \frac{c}{\lambda}$
where c is the speed of light and $\lambda$ is the photon's wavelength. By plugging numbers into the equation, we find
$f= \frac{c}{\lambda}= \frac{3 \cdot 10^8 m/s}{4.5 \cdot 10^{-7} m}=6.67 \cdot 10^{14}Hz$

And so now we can find the photon energy
$E=hf=(6.6 \cdot 10^{-34} Js)(6.67 \cdot 10^{14}Hz )=4.4 \cdot 10^{-19} J$

We know that 1 Joule corresponds to
$1 J = 1.6 \cdot 10^{-19} eV$
So we can convert the photon's energy into electronvolts:
$E= \frac{4.4 \cdot 10^{-19} J }{1.6 \cdot 10^{-19} J/eV}=2.75 eV$

4 0

4 years ago

The blackbody curved for a star named Beta is shown below. What is the surface temperature of the star rounded to the nearest wh

marshall27 [118]

<span>Then, since the peak wavelength of the star Beta is 200nm, use Wein law and round 200 to the nearest WHOLE NUMBER. Hope that helps. </span>

3 0

3 years ago

Read 2 more answers

Select all that apply. The three types of rock in the Earth's crust are _____.

ale4655 [162]

1, 5 and 6 are the rocks your looking for, they make up the other ones on your list

7 0

3 years ago

Hooke's law states that the force, F, in a spring extended by a length x is given by

timofeeve [1]

Answer:

dimensions of k are kg / s^2

Explanation:

F=ma (Newton's second law)

F=-kx (Hooke's law)

so equate both

-kx = ma

k = -ma/x

= mass * acceleration / distance (dimensions, -1 has no dimension)

= kg * m/s^2 / m

= kg / s^2

6 0

3 years ago