Which are true for a photon. (Choose 3)
o Energy can be calculated.
o Is the same thing as an electron.
o Is the smallest packet of light.
o Energy cannot be calculated.
o The higher the frequency, the higher the energy. o The higher the frequency, the lower the energy.

Please help

What is the frequency of a light wave with a wavelength of 620nm

Aspring is used to stop a 50-kg package which is moving down a 20º incline. the spring has a constant k = 30 kn/m and is held by cables so that it is initially compressed 50 mm. knowing that the velocity of the package is 2 m/s when it is 8 m from the spring and neglecting friction, determine the maximum additional deformation of the spring in bringing the package to rest.

If jason ii needs 15 kw of power at 300 volts to operate, what amperage of current must flow through the cable?