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Zepler [3.9K]
3 years ago
11

Fred points a toy laser gun at a wall. Considering that the frequency of the gun's light is 4.91 × 1014 hertz and that Planck’s

constant is 6.61 × 10-34 joule·seconds, what is the energy of the laser light?
A) 3.24 × 10-21 joules
B) 4.91 × 1015 joules
C) 2.04 × 10-21 joules
D) 4.92 × 10-18 joules
Physics
2 answers:
vladimir1956 [14]3 years ago
6 0
E=hf 

<span>E=6.61x10^34x4.91x10^14 </span>
<span>E=3.24x10^21 joules </span>

<span>Answer is A </span>
Stella [2.4K]3 years ago
4 0
The answer is 3.24 x 10^-21
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Virty [35]
Force = change in momentum / time, Force in opposite direction so negative
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6 0
3 years ago
A hot-air balloon is ascending at the rate of 12 m/s and is 80 m above the ground when a package is dropped over the side. (a) H
Debora [2.8K]

Answer:

Explanation:

Given

balloon is ascending at the rate of u=12\ m/s

Balloon is at a height of s=80\ m

As the package is dropped from the balloon it must possess the same initial velocity as the balloon

using

v^2-u^2=2as  

where v=final velocity

u=initial velocity

a=acceleration

s=displacement

v^2=12^2+2\times 9.8\times 80

v^2=1712

v=41.37\ m/s

time taken is  given by

v=u+at

substituting values

41.37=-12+9.8\times t

as we consider downward direction as positive

t=\frac{53.37}{9.8}

t=5.44\ s

therefore time taken to reach the bottom is t=5.44 s                                            

6 0
3 years ago
Which word in the sentence is a plural pronoun?
Basile [38]
(First, I guess you chose the wrong subject since this is English not Physics :p)
Now, the pronouns are words that take the place of a noun.
The Personal pronouns are: I, you, he, she, it, we, they.
I, you, he, she, it are singular; while we and they are plural.
So, in the sentence, we can clearly see the pronoun "we", which is a plural pronoun.
So the plural pronoun in this sentence is We (Answer D)

Hope this Helps! :)
5 0
3 years ago
Read 2 more answers
Match the type of boundary with its characteristic.
olga_2 [115]

At Divergent boundary, Crust is created.

At Convergent boundary, Crust is destroyed.

At Transform boundary, Crust is neither created nor destroyed.

<h3>What occurs at Divergent, Convergent and Transform boundary?</h3>

A divergent boundary occurs when two tectonic plates move away from each other. At this boundary, new oceanic crust is created.

Convergent boundaries are those boundaries where two plates are pushing into each other. These boundaries are pushing one of the plates under the other and back into the mantle to melt.

Transform boundaries are places where plates slide sideways past each other. At this boundary, Crust is neither created nor destroyed.

Learn more about boundary here: brainly.com/question/14298823

#SPJ1

7 0
2 years ago
Can somebody help me with this
Ivanshal [37]

this is simple the word your looking for is 8 letters long and the definition is key to the answer


6 0
3 years ago
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