Violet light (410 nm) and red light (685 nm) pass through a diffraction grating with d=3.33x10^-6 m. What is the angular separation between them for m=2?

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

I'm thinking it's 2 you are asked to explain the earth's magnetic field. which is the best reply? 1. the earth's magnetic south is similar to the north pole of a magnet. 2. the earth's core has a strong magnetic charge similar to the south pole of a magnet. 3. the earth's geomagnetic south is similar to the south pole of a magnet. 4. the earth's magnetic charge is not centered at either pole; it varies based on location.

Acar travels in reverse. it covers 150 meters in 12 seconds what is the velocity of the car what is the speed of the car