Two photons of electromagnetic radiation, A and B, are propagating in a vacuum. If photon A is less energetic than photon B, then A)
A has lower frequency and longer wavelength than B.

B)
A has higher frequency and longer wavelength than B.

C)
A has higher frequency and shorter wavelength than B.

D)
A has lower frequency and shorter wavelength than B.

the first american roller coaster was the mauch chunk switchback railway, built in the mountains of pennsylvania in the mid-1800s. the track, originally built to send coal to a railway, was reconfigured as a "scenic tour."

the working equation for the angular size is the product of the physical size and 360 degrees divided by the product of two pi and distance from earth. the minimum size would be 0.559 degrees while the maximum size would be 0.49 degrees.