What will most likely happen if a sound wave moves from the air through a solid?
a) it will increase in wavelength.
b)it will decrease in speed.
c) it will increase in speed.
d)it will decrease in wavelength.

answer only if you're 100% sure about this because i've seen a bunch of different answers.

Moon effect. some people believe that the moon controls their activities. if the moon moves from being directly on the opposite side of earth from you to being directly overhead, by what percentage does (a) the moon's gravitational pull on you increase and (b) your weight (as measured on a scale) decrease? assume that the earth–moon (center-to-center) distance is 3.82 × 10^8 m, earth's radius is 6.37 × 10^6 m, moon's mass is 7.36 × 10^22 kg, and earth's mass is 5.98 × 10^24 kg.

Abeam of electrons with of wavelength of 7.5 x 10-6 m is incident on a pair of narrow rectangular slits separated by 0.75 mm. the resulting interference pattern is projected onto a screen 10.0 m from the slits. what is the separation of the interference maxima in the resulting interference pattern?

Amira pulls a 3 pound wagon 4 feet. how much work has she done?