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3 years ago

Use the following photoelectric graph to answer the following question:

Physics

1 answer:

klio [65]3 years ago

5 0

The photoelectric effect is obtained when you shine a light on a material, resulting in the emission of electrons.

The kinetic energy of the electrons depends on the frequency of the light:
K = h(f - f₀)

where:
K = kinetic energy
h = Planck constant
f = light frequency
f₀ = threshold frequency

Rearranging the formula in the form y = m·x + b, we get:
K = hf - hf₀
where:
K = dependent variable
f = <span>indipendent variable
h = slope
hf</span>₀ = y-intercept

Every material has its own threshold frequency, therefore, what stays constant for all the materials is h = Planck constant (see picture attached).

Hence, the correct answer is C) the slope.

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calculate the average speed of an athele who runs a distance of 100m in 16 s and an additional of 400m in a 44s

Delvig [45]

Explanation:

speeds = distance/time

=100/16

=6.25m/s

second speed is;

400/44 =9.09

av. speed = total speed /n

= (6.25+9.09)/2

=7.67 m/s

5 0

2 years ago

Lewiston and Vernonville are 208 miles apart. A car leaves Lewiston traveling towards Vernonville, and another car leaves Verno

iragen [17]

Answer:

Average speed of the car A = 70 miles per hour

Average speed of the car B = 60 miles per hour

Explanation:

Average speed of the car A is $v_{A} =\frac{x_{A} }{t_{A} }$ (Equation A) and Average speed of the car B is $v_{B} =\frac{x_{B} }{t_{B} }$ (Equation B), where $x_{A}$ and $x_{B}$ are the distances and $t_{A}$ and $t_{B}$ are the times at which are travelling the cars A and B respectively.

We have to convert the time to the correct units:

1 hour and 36 minutes = 96 minutes

$96 minutes . \frac{1 hour}{60 minutes} = 1.6 h$

From the diagram (Please see the attachment), we can see that at the time they meet, we have:

$v_{A} = \frac{208-x}{1.6h} + 10\frac{miles}{h}$ (Equation C)

$v_{B} = \frac{208-x}{1.6h}$ (Equation D)

From Equation A and C, we have:

$\frac{208-x}{1.6}+10 = \frac{x}{1.6}$

208-x+16 = x

208 + 16 = 2x

$x = \frac{224}{2}$

x = 112 miles

Replacing x in Equation A:

$v_{A} = \frac{112miles}{1.6h}$

$v_{A} = 70 miles per hour$

Replacing x in Equation B:

$v_{B} = \frac{208miles-112miles}{1.6h}$

$v_{B} = \frac{96miles}{1.6h}$

$v_{B} = 60 miles per hour$

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3 years ago

William B. Hartsfield was a man of humble origins who became one of the greatest mayors of Atlanta. He served as mayor for six t

Genrish500 [490]

Answer:

bv guy iukl,

Explanation:

sdfghjkljxcvbnjjjjjjj

6 0

3 years ago

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Many objects orbit the sun in the Kuiper belt. should such an object be called a comet if it does not have a tail? develop an ar

Digiron [165]

Comets are cosmic snowballs of frozen gasses, rock and dust that orbit the sun. When frozen, they are the size of a small town. When a comet's orbit brings it close to the sun, it heats up and spews dust and gasses that form a tail that stretches away from the sun fr millions of miles. There are probably billions of comets orbiting our sun in the Kuiper Belt and even more distant Oort Cloud. Comets have right for its name and had best to orbit the sun in the Kuiper Belt.

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3 years ago

A mixing blade on a food processor extends out 3 inches from its center. if the blade is turning at 600 revolutions per minute,

7nadin3 [17]

First let's convert everything into SI units.
The length of the blade is 3 inches. Keeping in mind that 1 inc=0.025 m, we have
$L=3 in \cdot 0.025 \frac{m}{inc} =0.075 m$
The angular speed is 600 revolutions per minute. Keeping in mind that $1 rev=2 \pi rad$ and $1 min=60 s$ , the angular speed becomes
$\omega = 600 \frac{rev}{min} \frac{2 \pi rad/rev}{60 s/min}=62.8 rad/s$

And so, the linear velocity of the edge of the blade is equal to
$v=\omega L=(62.8rad/s)(0.075 m)=47 m/s$

8 0

2 years ago

Read 2 more answers