Why might a scientist repeat an experiment if he/she did not make a mistake in the first one? an experiment should be repeated to a) increase income for increased work. b) prove how interesting the study was. c) ensure the results are accurate. eliminate d) eliminate steps and save time.

Asample of silver (with work function ? = 4.52 ev) is exposed to an ultraviolet light source (? = 200 nm), which results in the ejection of photoelectrons. what changes will be observed if: silver is replaced with copper (? = 5.10 ev) more photoelectrons ejected no photoelectrons are emitted fewer photoelectrons ejected more energetic photoelectrons (on average) less energetic photoelectrons (on average)

2points why do scientists need governmental funding? o a. government politicians ask all the important scientific questions. o b. scientists have to pay taxes to the government on the money they make. o c. the cost of doing scientific research can be very high. o d. the government is controlled by scientists. submit

The chemical bond connecting one nucleotide with the next one along the nucleic acid chain is called a