When you rub two sticks together, it causes friction. What does the friction produce? A. sound energy B. heat energy C. electrical energy D. light energy

When an object is heated it contracts. a. true b. false

Red light strikes a metal surface and electrons are ejected. if violet light is now used with a 10% greater intensity, what will happen to the ejection rate (number of ejected electrons per second) and the maximum energy of the electrons? a) greater ejection rate; same maximum energyb) same ejection rate; greater maximum energyc) greater ejection rate; greater maximum energyd) same ejection rate; same maximum energye) none of the above answers are correct

Which of the following are guidelines to follow for obtaining accurate observations