Neon discharge tubes emit a light with a wavelength of 600. nm that appears deep orange to the human eye. how many photons of this electromagnetic radiation amount to 250. j of energy?

Explanation:

The energy of a photon of wavelength is given by

where

is the Planck constant

is the speed of light

In this problem, the wavelength of the photon is

So the energy of one photon with this wavelength is

In order to have a total energy of E = 250 J in this radiation, we have to divide this value by the energy of a single photon, so we find the number of photons that we need:

the independent variable, the one that is intentionally manipulated, is whether or not the car hits the barrier.

the dependent variable, the one that you measure the response in, is the distance that the washers travel.

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.