Observing the sun's light through a spectroscope has indicated that the sun contains large amounts of: helium hydrogen radioactive elements oxygen

Which of the following represents a virtual image?

Which features on mars point to the possibility of liquid water on the planet? impact craters with sharp rims volcanic cones with craters gullies and stream-like channels mountain ranges with faults

Consider a hydrogen atom in the ground state. what is the energy of its electron? =e= jj now consider an excited‑state hydrogen atom. what is the energy of the electron in the =5n=5 level? =e5= j