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)

10. There are two inclined planes, with angles θ1=60° and θ2=45° relative to the horizontal. Two objects with masses M₁=2(kg) and M2=1(kg) (both are initially at rest) slide down the inclined planes from the same height h as shown in Figure 2. Assuming the time taken to reach the bottom (point A in the figure) are t1 and t2 respectively, what is the ratio? (A) t1/t2=0.816 (B) t1/t2= 1.224 (C) t1/t2=1.150g (D) t1/t2=0.707

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)

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