A wave and a crest are travelling toward each other. The crest has an amplitude of
3 cm and the trough has an amplitude of 2
cm. What is the amplitude of the
resulting wave when they interact?
a trough of 1 cm
a crest of 5 cm
a crest of 1 cm
a trough of 5 cm

Modern physics a photon emitted from an excited hydrogen atom has an energy of 3.02 electron volts. which electron energy-level transition would produce this photon? a. n=1 to n=6 b. n=2 to n=6 c. n=6 to n=1 d. n=6 to n=2 i chose b but the correct answer is d can someone tell me why? and what's the difference?

We have a colorless transparent liquid. it looks like water. we seperated it into a solid and a liquid by evaporration and condention was this a chemichal or a physical seperation a. chemical seperation b. physical seperation

What is the force that opposes motion and works against the downward pull? a) friction b) gravity c) weight d) acceleration