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irinina [24]
3 years ago
14

A magnesium surface has a work function of 3.60 eV. Electromagnetic waves with a wavelength of 320 nm strike the surface and eje

ct electrons. Find the maximum kinetic energy of the ejected electrons. Express your answer in electron volts.
Physics
1 answer:
Vladimir79 [104]3 years ago
6 0

Answer:

K(maximum) = 0.284 eV

Explanation:

Given data

work function ω = 3.60 eV = 3.60 × 1.6 ×10^{-19} = 5.76 ×10^{-19} J

wavelength λ = 320 nm  = 320 ×10^{-9} m

to find out

maximum kinetic energy

solution

we know that speed of light is =  3 ×10^{8} m/s

and planck constant h = 6.63 ×10^{-34} J.s

we will apply here Einstein's photo elecric equation that is

hc/λ  =  ω + K(maximum)

put here all these value we get

6.63 ×10^{-34} ×  3 ×10^{8}  / 320 ×10^{-9} =   5.76 ×10^{-19}  + K(maximum)

so

K(maximum) = 6.63 ×10^{-34} ×  3 ×10^{8}  / 320 ×10^{-9} - 5.76 ×10^{-19}

K(maximum) = 0.4556 ×10^{-19}  J

K(maximum) = 0.4556 ×10^{-19}  / 1.6  ×10^{-19}

K(maximum) = 0.284 eV

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kaheart [24]
No problem, and you already know all about it.

Here are a few examples of same volume / different weight:

-- A bottle full of water is heavier than the same bottle when it's full of air.
-- Stones are heavier than styrofoam chunks the same size.
-- A bowl of meat loaf is heavier than a bowl of scrambled eggs.

In each example, two things have the same volume, but one weighs more than
the other.  I didn't say anything about mass yet, but that's easy:  As long as you
keep everything on Earth, more weight means more mass.

So how come, in each example, things with the same volume have different mass ?
This was your original question.

The answer is just the simple fact that there are millions of different substances, and
each different substance packs a different amount of mass into the same volume.

The amount of mass that a substance packs into a standard volume is called
the <em>density</em> of the substance.  Meat loaf is more dense than scrambled eggs.
Stone is more dense than styrofoam.  Water is more dense than air.  And <em>gold</em>
is 19 times as dense as water.  If you have a jar that holds a pound of water, and
you pour out the water and fill the jar with gold, the same jar holds 19 pounds of gold,
because the density of gold is 19 times the density of water.

The reason you were assigned to think about this question for homework is that
next time your Physics class meets, you'll start talking about <em>Density. </em><em /> And you're
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6 0
4 years ago
State a hypothesis about what might happen as you proceed through the lab.
Kamila [148]

A hypothesis about what might happen in the lab might be 'oxygen will react with hydrogen to form water molecules'.

<h3>What is a hypothesis?</h3>

A hypothesis is a given explanation of a particular scientific question emerged by observing the real world.

Hypotheses are explanations that must be tested (either confirmed or rejected) by using the scientific method.

In conclusion, a hypothesis about what might happen in the lab might be 'oxygen will react with hydrogen to form water molecules'.

Learn more about lab hypothesis here:

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6 0
3 years ago
What effect will the following have on the inertia of a body if
Step2247 [10]

Explanation:

Inertia is the tendency of a body to remain at rest or to do nothing.

It is the resistance to any change in position of body.

 When the force on a body increases, the inertia reduces

 When the mass is reduced the inertia reduces

According to newton's first law or the law of inertia "an object will remain in its state of rest or of uniform motion unless if it is acted upon by an external force".

7 0
3 years ago
Question 11 Saved
BaLLatris [955]
2is the right anwser


8 0
3 years ago
Read 2 more answers
A bowling ball weighing 71.7 N is attached to the ceiling by a rope of length 3.73 m . The ball is pulled to one side and releas
vekshin1

Answer:

A) a = 5.673 m/s²

The direction will be upwards vertically towards the point where it is suspended.

B) T = 113.2 N

Explanation:

A) We are given;

Weight of bowling ball; W = 71.7 N

Speed; v = 4.6 m/s

Rope length; r = 3.73 m

Now, formula for the centripetal acceleration is;

a = v²/r

Thus; a = 4.6²/3.73

a = 5.673 m/s²

The direction will be upwards vertically towards the point where it is suspended.

B) since weight is 71.7 N, it means that;

Mass = weight/acceleration = 71.7/9.8

Mass(m) = 7.316 kg

Thus,

Centripetal force is;

F_cent = 7.316 × 5.673

F_cent = 41.5 N

Thus, Tension in the rope is;

T = W + F_cent

T = 71.7 + 41.5

T = 113.2 N

4 0
3 years ago
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