An acetate rods rubs against a cloth. What type of charge will the rod end up with? A. Positive
B. Negative
C. Not enough info
D. Neutral

Which type of electromagnetic waves are dangerous enough to be used to kill cancerous cells? (a)gamma rays (b)visible light (c)infrared light (d)microwaves

Awave travels at a speed of 5.2 m/s. if the distance between crests is 0.40 m, what is the frequency of the wave? use f=v/wavelength a. 13 hz b. 2.1 hz c. 0.077 hz d. 5.6 hz

Which two particles are found in the center of an atom