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25. In a double-slit interference experiment, the slit separation is 0.48(mm), and the distance to the screen is 1.3(m). Within a range 15(mm) on the screen, 12 bright fringes are observed. Determine the wavelength of the light source used. (A) 434.1 (nm) (B) 613.0 (nm) (C) 722.1 (nm) (D) 503.5 (nm)

24. On a plane, a massless long rod connects two point masses M1=2.2 (kg) and M2=3.1 (kg) at its ends, with a fixed axis of rotation as shown in Figure 9, where R1=0.37(m) and R2=0.24(m). The axis is perpendicular to the plane of the page. A bullet of mass m=0.2(kg) traveling at a velocity v=15(m/s) perpendicularly strikes M1 and embeds itself in M1, causing the rod to rotate about the axis. Calculate the angular velocity. M V m R rotational axis R (A) =2.31 (rad/sec) (B) =2.19 (rad/sec) (C) =2.77 (rad/sec) (D) o-2.01 (rad/sec) M M₂ Figure 9

23. The electric dipole moment p=pkof a molecular is formed by two equal charges of opposite sign +q and -q, separated by a distance d = 2.4 x 10-10 (m) and given q=2.0×10-20 (Coul). The electric dipole is placed in a uniform electric field E=3.5×109+4.2×10°k (N/Coul) as shown in Figure 8. Find the magnitudes of the electric dipole moment of this molecular and the torque |т| exerted on the electric dipole. (A) p=4.8×10-30 (Coulm), and || = 2.02×10-24 (N.m) (B) p=9.6×10-30 (Coul·m), and |t| = 3.36×10-24 (N.m) (C) p=4.8×10-30 (Coul·m), and |t| = 1.68×10-24 (N.m) (D) p=9.6×10-30 (Coul-m), and |t| = 4.03×10-24 (N.m)

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1. Some studies suggest that the most powerful __________of longevity is exercise. (A) quandary (B) subtlety (C) protestation (D) determinant

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