Multiple choice questions. Please help ASAP!
A.
When an object is moving with 40050 km/s, the original blue light is now seen as yellow light, the object is.
a. moving away from the observer
b. moving towards the observer
c. is stationary.
B.
what is the change in wavelength?
a. no change
b. increased about 100 nm
c. decreased about 100 nm
d. not enough information to determine if it is increased or decreased.

Scientist have use computer models to create a series of maps that show how susceptible coastal cities in island countries are to the sea rising at different levels. the map shows that a 1 meter rise would swap cities all along the us eastern seaboard. a 6-meter sea level rise with sub merge a large part of florida. thermal expansion has already raise the oceans 10 to 20 centimeters the most likely cause, directly and indirectly, for such a rise in sea level is