50. mechanical waves such as sound waves trav...

50. mechanical waves such as sound waves travel at different speeds as they move through mediums. which of the following has the mediums in the correct order for sound waves to move from slowest to fastest?\na) liquids --> gases --> solids\nb) gases --> liquids --> solids\nc) solids --> liquids --> gases\nd) gases --> solids --> liquids\n51. which of the following examples best describes an effect of people moving to large cities?\na) more land is available in large cities to grow crops.\nb) wildlife diversity increases due to more open spaces within the city.\nc) emissions from motor vehicles increase smog in the air that can trap heat from the sun.\nd) the greater concentration of people in large cities reduces overall waste production and accumulation on earth.\n52. a scientist has collected data about four bird species living in the same environment. the table lists the size of each population and the diet of each species. an insecticide was sprayed in the environment and killed many of the beetles. which bird species would be most likely to survive this environmental change?\na) species a\nb) species b\nc) species c\nd) species d

Answer

### 50. # Brief Explanations: Sound waves travel fastest in solids as the particles are closely - packed, allowing for efficient transfer of vibrations. Liquids have looser particle arrangement than solids and gases have the most spread - out particles, so sound travels slowest in gases. # Answer: b) Gases --> liquids --> solids ### 51. # Brief Explanations: When people move to large cities, more motor vehicles are present, leading to increased emissions. These emissions contribute to smog formation, which can trap heat from the Sun. # Answer: c) Emissions from motor vehicles increase smog in the air that can trap heat from the Sun. ### 52. # Brief Explanations: The bird species least dependent on beetles in its diet will be most likely to survive the reduction in beetle population due to insecticide spraying. Without the table data, we assume the species with a more diverse diet not centered on beetles has an advantage. # Answer: (Insufficient data in the question to determine a specific answer among a) Species A, b) Species B, c) Species C, d) Species D)