In an experiment to study the photoelectric effect, a scientist measures the kinetic energy of ejected electrons as afunction of the frequency of radiation hitting a metal surface. She obtains the following plot The point labeled " v0 "corresponds to light with a wavelength of 680 nrn (a)What is the value of in 5-1? (b)What is the value of the work functionof the metal in units of of ki/mol ejected electrons? (c) What happens when the metal is irradiated with light of frequencyless than Vo? (d) Note that when the frequency of the light is greater than Vo, the plot shows a straight line with a nonzeroslope. Why is this the case? (e) Can you determine the slope of the line segment discussed in part (d)? Explain.

Aroller coaster car is traveling down a track at 22 m/s. the car has a mass of 2000 kg. what is the kinetic energy of the car? a) 22,000 j b) 968,000 j c) 484,000 j d) 44,000 j

When svante arrhenius first proposed his acid-base theory, he was a doctoral candidate. his professors thought his ideas were unfounded. within a decade, the arrhenius theory of acid-base was widely accepted and praised within the scientific world. arrhenius defined acids as compounds having ionizable hydrogen and bases as compounds with ionizable a) barium. b) hydronium. c) hydroxide. d) oxygen.

Air pressure is measured in pascals. for a professional american football game, the ball should be inflated to about 90,000 pascals. scientists studied the effects of air temperature on the pressure inside american footballs by taking these steps: 1. prepare 100 footballs. 2. measure each football's air pressure. 3. divide footballs into 10 groups. 4. place the groups in different lockers cooled to different air temperatures. 5. after 12 hours, remove the footballs from lockers. 6. measure each football's pressure again. 7. compare the new pressures to the starting pressures. what two terms best describe the variable "air pressure inside the football" in this experiment? independent, qualitative independent, quantitative dependent, qualitative dependent, quantitative