Physics, 19.07.2019 16:30 daniella1304

Use the following photoelectric graph to answer the following question: graph titled photoelectric effect for a photomissive metal is shown. the y axis is labeled kinetic energy and scales from negative 2 to positive 4 electron volts. the x axis is labeled frequency from 0 to 11 times 10 to the 14 hertz. a straight line connects the points 0, negative 1.2 and 5.5, 1 and 9, 2.5. if you use a different experimental photo-missive material, what would be the same on the graph? a the y-intercept b the intercept c the slope

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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 = indipendent variable
h = slope
hf₀ = 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.

Use the following photoelectric graph to answer the following question: graph titled photoelectric

Use the following photoelectric graph to answer the following question: graph titled photoelectric

Answer from: Quest

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

$f\alpha \frac{dp}{dt}$

⇒ $f= k \frac{dp}{dt}$

here k is the proportionality constant whose value is 1.

$f=\frac{dp}{dt}$

$f= \frac{d[mv]}{dt}$

$f= m\frac{dv}{dt} +v\frac{dm}{dt}$

$f=ma+v\frac{dm}{dt}$ [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.

Answer from: Quest

snell's law

refractve index = sin incidence / sin refraction

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Use the following photoelectric graph to answer the following question: graph titled photoelectric...

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