- 1. Why does no critical angle exist for light travelling from a fast medium into a slow medium?
- 1. Write balanced nuclear equations for the following: the a decay of lead-208 B. the beta ^- decay of nitrogen -15 C. the beta ^+ decay of selenium -73
- Multiple Choice point 11. A student claims that unbalanced forces acting on an object in motion can cause an object to change speed or direction. The best evaluation of this student's claim Is that - C. he is partially correct, unbalanced forces only change direction D. he is correct because unbalanced forces can change speed or direction B. he is partially correct, unbalanced forces only change direction A. he is not correct
- 5. Dila melakukan percobaan gelombang dan diperoleh hasil sebagai berikut. Perc ke- & mathrm(T)(mathrm(s)) & lambda(mathrm(m)) & v(mathrm(~m) / mathrm(s)) 1 & 1 & 1 & ldots 2 & 2 & 1 & ldots 3 & 3 & 1 & ldots 4 & 4 & 1 & ldots 5 & 5 & 2 & ldots 6 & 5 & 3 & ldots 7 & 5 & 4 & ldots 8 & 5 & 5 & ldots Hitunglah cepat rambat gelombang (v) pada percobaan di atas! Analisislah dan simpulkan bagaimana hubungan periode dan panjang gelombang terhadap cepat rambat gelombang!
- 17. A projectile is fired aran angle of 35^circ relative to the horizontal (upwards) with a speed of 20m/s (linore air resistance,Calculate the a. horizontal componen of the projectile's initial velocity, [16m/s] b. vertical component of the projectile's initial velocity. [11m/s] c. time the projectile is in the air. [2.] I d. horizontal distance the projectile travels (Le, it range), [3B m]
