As a sound wave travels from liquid water into ice, its wavelength would
a) decrease due to wave speed decreasing as it passes through the ice.
b) increase because the wave speed and frequency have increased.
c) decrease since the frequency is now lower.
d) increase in order to keep the frequency the same due to the increase in speed.

Visualize the problem and identify special cases first examine the problem by drawing a picture and visualizing the motion. apply newton's 2nd law, ∑f⃗ =ma⃗ , to each body in your mind. don't worry about which quantities are given. think about the forces on each body: how are these consistent with the direction of the acceleration for that body? can you think of any special cases that you can solve quickly now and use to test your understanding later? one special case in this problem is if m2=0, in which case block 1 would simply fall freely under the acceleration of gravity: a⃗ 1=−gj^.