1. an electromagnetic wave in a vacuum has a wavelength of 0.07 m. what is its frequency?
f = 3.0 • 108 m/s
f = 4.3 • 109 hz
f = 3.0 • 109 hz
f = 4.3 • 108 m/s
2. which of the following occurs as light travels farther from its source?
far from the source, photons come together in a small area.
the intensity of light increases as photons move away from the source.
the source gives off less light as photons move away from it.
far from the source, photons spread over a larger area.
3. infrared rays have a shorter wavelength than
ultraviolet rays.
x-rays.
radio

Lightning is an example of what phenomenon? a release of a large amount of energy an absorption of a large amount of energy a natural electric circuit a natural electric current

What is the kinetic energy of a baseball moving at a speed of 40 m/s if the baseball has mass of 0.15 kg?

You have two photos of a person walking. one shows the person at the corner of third and main streets, the other shows the person at the corner of tenth and main streets. there are lampposts at every corner in this town, and the first picture shows it to be 10: 32: 00 exactly. the second picture shows it to be 10: 49: 30. you know three facts: (1) all of the clocks are synchronized; (2) there are exactly 12 equal-sized blocks per kilometer in this town; and (3) the streets that cross main in this area are numbered consecutively, with no interruptions. what is the person’s average speed in kilometers per hour?