The name iron (ii) chloride would indicate that the compound contains a. iron ions with 11+ charge b. iron ions with a negative charge c. two ions of chlorine d. non of the above.

The two most prominent wavelengths in the light emitted by a hydrogen discharge lamp are 656 nm(red) and 486 nm (blue). light from a hydrogen lamp illuminates a diffraction grating with 520lines/mm , and the light is observed on a screen 1.5m behind the grating. part a what is the distance between the first-order red and blue fringes? express your answer to two significant figures and include the appropriate units.

The image shows a pendulum in simple harmonic motion the pendulum starts at a and swing to e

Difference between series and parallel circuits