Describe the changes in potential energy, kinetic - id14984295, AlwaysMarcus5577

Question

Physics: Describe the changes in potential energy, kinetic energy, and speed as the skater goes up down the ramp. Why do you think this happens? Use and bold these words in your answer. Energy, transfer, potential energy, kinetic energy, speed, mass, height.

AlwaysMarcus5577 · Accepted Answer

We can calculate the energy of a single photon through Plank-Einstein relation. We have

E = hv

where

is the Plank's constant and

is the frequency. Also, recall that to solve for the frequency, we have

$v = \frac{c}{\lambda}$

where

is the speed of light and $\lambda$ is the wavelength of the laser, in meters. So for this problem we can compute for

with

$v = \frac{3.10^{8} m/s}{683.10^{-9} m} \\ v = 4.39.10^{14}$

Going back to the Planck-Einstein relation, we have

$E = (6.626.10^{-34} J.s)(4.39.10^14 s^{-1})$

Hence, we have $E = 2.91 x 10^{-19} J$ .

Given that the laser emits an energy of 0.258 J, then there are

$number of photons = \frac{0.258}{2.91 x 10^{-19}} \\ number of photons = 7.5 x 10^{18}$ .

7.5 ⋅ 10^18 photons

Describe the changes in potential energy, kinetic energy, and speed as the skater goes up down the ramp. Why do you think this happens? Use and bold these words in your answer. Energy, transfer, potential energy, kinetic energy, speed, mass, height.

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