You rub a clear plastic pen with wool, and observe that a strip of invisible tape is attacted to the pen. assuming that the pen has a negative charge, which of the following could be true? select all that apply. :

a. the tape might be negatively charged.

b. the tape might be positively charged.

c. the tape might be uncharged.

d. there is not enough information to conclude anything.

Which of the choices are parts of an atom? select all that apply. a.) compound b.) electron c.) neutron d.) molecule e.) photon f.) proton g.) element

Select light for the type of wave, adjust the wavelength so that the light is red, and increase the amplitude of the light to the max. then, select the start button at the source location to begin producing the waves. light is a form of electromagnetic wave, containing oscillating electric and magnetic fields. the wave amplitude detector mentioned above shows how the electric field oscillates in time at the location of the probe. the amplitude of the wave at the location of the probe is equal to the maximum electric field measured. how does the amplitude of the wave depend on the distance from the source?

How does the formation of intrusive and extrusive igneous rocks differ?