1. During a photoelectric effect experiment, light possessing 2.56 eV of energy is incident on the photosensitive material. The work function of the material is 0.250 eV. What is the kinetic energy of the emitted electrons?

A. 3.70 x 10^-19 J

B. 4.50 x 10^-19 J

C. 4.00 x 10^-20 J

D. 4.10 x 10^-19 J

2. A pendulum of length 1.0 meter is set into motion. At point A on the pendulum, it knocks into a mass on a spring and sets the mass in motion. Assuming both the pendulum and the spring have the same period, what is the ratio of mass/spring constant?

A. 1.92

B. 10.43

C. 0.10

D. 0.56

3. How long would an instrument which is open at one end have to be in order to hear the 5th harmonic at 4000 Hz on an open tube? Assume the speed of sound is 340 m/s.

A. 0.51 m

B. 0.11 m

C. 0.44 m

D. 0.21 m