A student drops a rock in a pond and notices that her reflection in the water becomes less clear. Which statement best explains the student’s observation?(1 point)
Responses
The surface of the water is no longer hard after the rock is dropped in the pond.
The surface of the water is no longer hard after the rock is dropped in the pond.
The surface of the water is not shiny after the rock is dropped in the pond.
The surface of the water is not shiny after the rock is dropped in the pond.
The water is not a smooth surface after the rock is dropped in the pond.
The water is not a smooth surface after the rock is dropped in the pond.
The water is not able to reflect waves after the rock is dropped in the pond.
The water is not a smooth surface after the rock is dropped in the pond.
A builder wants to make a room soundproof in a new home. The builder should use materials that _____.(1 point)
Responses
absorb sound waves and prevent echoes
absorb sound waves and prevent echoes
reflect sound waves and create echoes
reflect sound waves and create echoes
reflect sound waves and prevent echoes
reflect sound waves and prevent echoes
absorb sound waves and create echoes
absorb sound waves and prevent echoes
A student puts a piece of black paper and a piece of white paper in the same sunny spot. After 30 minutes, she observes that the black paper feels warmer than the white paper. Which best explains the student’s observation?(1 point)
Responses
The black paper receives stronger waves from the sun than the white paper.
The black paper receives stronger waves from the sun than the white paper.
The black paper reflects more waves from the sun than the white paper.
The black paper reflects more waves from the sun than the white paper.
The black paper absorbs more waves from the sun than the white paper.
The black paper absorbs more waves from the sun than the white paper.
The black paper prevents waves from the sun from reaching the white paper.
The black paper absorbs more waves from the sun than the white paper.
During a baseball game, the sound of the bat hitting the ball can be heard in most parts of the stadium. That sound is weaker at greater distances. What is the cause of this phenomenon?(1 point)
Responses
The sound waves can only travel through certain materials.
The sound waves can only travel through certain materials.
The sound waves are blocked by people in the stadium.
The sound waves are blocked by people in the stadium.
The sound waves slow down as they move away from the bat.
The sound waves slow down as they move away from the bat.
The sound waves are spread out over a large area.
The sound waves are spread out over a large area.
Which type of wave can travel through a vacuum?(1 point)
Responses
light
light
sound
sound
mechanical
mechanical
seismic