The longest wavelength of a photon that can be emitted by a hydrogen atom, for which the initial state is n = 3, is closest to which one of the following values? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A) 625 nm B) 600 nm C) 550 nm D) 658 nm E) 575 nm
D
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Charge in an Electric Field: An electron is projected with an initial velocity v0 = 8.4 × 107 m/s along the y-axis, which is the centerline between a pair of charged plates, as shown in the figure. The plates are 1.0 m long and are separated by 0.10 m. A uniform electric field of magnitude E in the +x-direction is present between the plates. If the magnitude of the acceleration of the electron is measured to be 8.9 × 1015 m/s2, what is the magnitude of the electric field between the plates? (e = 1.6 × 10-19 C, melectron = 9.11 × 10-31 kg) 
A. 51,000 N/C B. 45,000 N/C C. 40,000 N/C D. 35,000 N/C E. 29,000 N/C
If M = 0.50 kg, L = 1.2 m, and the mass of each connecting rod shown is negligible, what is the rotational inertia about an axis perpendicular to the paper through the center of mass? Treat the mass as particles.
?
?
A. 3.7 kg?m2 B. 2.8 kg?m2 C. 3.2 kg?m2 D. 2.3 kg?m2 E. 3.9 kg?m2
The distance between the object and the eyepiece of a compound microscope is 18.0 cm. The focal length of its objective lens is 0.80 cm
and the eyepiece has a focal length of 2.3 cm. The near-point distance of the person using the microscope is 25.0 cm. What is the total overall magnification of the microscope? A) -120 x B) -184 x C) -200 x D) -360 x E) -480 x
What is the self-inductance of a solenoid 30.0 cm long having 100 turns of wire and a cross-sectional area of 1.00 × 10-4 m2? (?0 = 4? × 10-7 T ? m/A)
A) 4.19 µH B) 4.19 nH C) 4.19 mH D) 4.19 H E) 4.19 pH