PHILOS 1332 Chapter 2: Chpt 2 pt 5

Chapter 27 part 2: Work function
The work function of a certain material is 4.9 eV. What is thephotoelectric cut-off wavelength for this material?


A. 1.3 × 10-7 m

B. 2.5 × 10-7 m

C. 3.3 × 10-7 m

D. 3.9 × 10-7 m

E. 4.4 × 10-7 m

The 2.4-m reflecting Hubble Space Telescope has been placedintoEarth orbit by the space
shuttle. What angular resolution could this telescope achieve ifthewavelength is 500 nm?
A) 2.5 x 10^-7 rad
B) 3.6 x 10^-7 rad
C) 5.7 x 10^-7 rad
D) 6.8 x 10^-7 rad