An explosion is seen from a distant volcano, and 6 seconds later you hear the sounds from the explosion. How far away is the volcano?

If three different elements each have an atomic spectrum that includes a blue line, how can we know one element from another? (Choose the best answer)

When a light goes out in a room, other electrical devices continue to operate because most of the circuits in a house are wired in 

The type of atom, whether it is Helium or Carbon, is determined by the number of 

Does the law of reflection apply to the surface below?

As a train approaches you with the whistle blowing, as you stand still, the wavelengths of the sound will be (choose any correct answer or answers)

Some transparent materials absorb and re-emit the light.

As the light travels from the fish to the person, what changes take place? (Choose any correct answer or answers)

Both Light and Sound are transverse waves with crests and troughs. 

To spear the fish, the person will need to aim