An electron moving perpendicular to a uniform magnetic field of 0.22 T moves in a circle with a speed of 1.5 107 m/s. What is the radius of the circle? (e = 1.60 10-19 C, melectron = 9.11 10-31kg)
A) 1.5 mm
B) 0.22 mm
C) 2.2 mm
D) 0.39 mm
E) 3.9 mm
Question 2
When light of wavelength 350 nm is incident on a metal surface, the stopping potential of the photoelectrons is 0.500 V.
What is the threshold (cutoff) frequency of this metal? (c = 3.00 108 m/s, h = 6.626 10-34 J s, 1 eV = 1.60 10-19 J)
A) 3.47 1014 Hz
B) 3.74 1014 Hz
C) 4.73 1014 Hz
D) 7.36 1014 Hz
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