An electron's de Broglie wavelength is 2.4 m. What is its speed?
A) 3.0 102 m/s
B) 2.5 105 m/s
C) 1.7 103 m/s
D) 8.3 106 m/s
Question 2
You have a choice between two lenses of focal lengths fa and fb, where fb = 2fa, to use as the objective lens in building a compound microscope. If the magnification you obtain using lens a is Ma, what will be the magnification when using lens b?
A) Mb = 2 Ma
B) Mb = 4 Ma
C) Mb = 8 Ma
D) Mb = Ma/4
E) Mb = Ma/2