Author Question: A succession of 2-m long water waves on a lake goes by a piece of floating cork that bobs up and ... (Read 33 times)

armygirl · **on:** Jul 29, 2018

A succession of 2-m long water waves on a lake goes by a piece of floating cork that bobs up and down one complete cycle each second. What is the speed of the wave?

A) 0.25 m/s
B) 0.50 m/s
C) 1.0 m/s
D) 2 m/s
E) 4 m/s

Question 2

A photocathode that has a work function of 2.4 eV is illuminated with monochromatic light having photon energy 3.5 eV. What is the wavelength of this light?

(c = 3.00 108 m/s, h = 6.626 10-34 J s, 1 eV = 1.60 10-19 J)
A) 350 nm
B) 330 nm
C) 300 nm
D) 380 nm
E) 410 nm