Question

pregunta 1 (5 puntos) (02.01 lc) which of the following is a characteristic of robust scientific knowledge? a it is frequently re - examined. b it is rarely subjected to arguments. c it has been disproven several times. d it develops over a short duration of time. pregunta 2 (5 puntos) (02.01 lc) which of the following provides evidence to support bohrs theory of atomic orbitals? a gold foil experiment b plum pudding model c spectrum of colors emitted by gas d radiation produced when beryllium is bombarded with alpha particles pregunta 3 (5 puntos) (02.01 mc) which of the following observations indicates that atoms of all elements contain small, negatively charged particles? a alpha particles are repelled by cathode rays of elements. b cathode rays are deflected towards a positively charged rod. c a particular frequency of light is produced by a gas in an excited state. d certain areas of the atom called orbitals contain all the charged particles.

Explanation:

• For Pregunta 1: Robust scientific knowledge is constantly re - evaluated and refined, so it is frequently re - examined.
• For Pregunta 2: The spectrum of colors emitted by gas provides evidence for Bohr's theory as it shows discrete energy levels corresponding to electron transitions between orbitals.
• For Pregunta 3: Since cathode rays are deflected towards a positively charged rod, it indicates that they are composed of negatively charged particles which are present in all elements.

Answer:

Pregunta 1: A. It is frequently re - examined.
Pregunta 2: C. Spectrum of colors emitted by gas
Pregunta 3: B. Cathode rays are deflected towards a positively charged rod.