Please help me, will mark correct answers as brainliest

Explain using examples, what is simple harmonic motion and why it is an important area of study in physics.

What type of light does this light bulb produce most (i. e. at what wavelength does the spectrum have maximum intensity)?

When is a current produced? when the terminals of an electrochemical cell are connected by a wire if the electric circuit is opened in an electrochemical cell if the electrolyte is removed from an electrochemical cell when the electrodes are reversed in an electrochemical cell