26. Sound travels faster in mediums with high elastic properties than lower elastic properties. Which of the following materials has a high elastic property? * 1 point
a. aluminum
b.plastic
c. rubber
d. steel
27. Among solids, the most rigid would transmit sound faster. On which material does sound travel faster?
a.glass
b.metal
c.rubber
d. wood
28. A pencil seems broken when it is inside a clear glass filled with clear water because of _____. *
a. Interference
b. Reflection
c. Refraction
d. Optical illusion
29. Light travels at the speed of _____ in a vacuum.
a. 100 000 000 m/s
b. 300 000 000 m/s
C. 400 000 000 m/s
d. 200 000 000 m/s
30. It is the measure of how much a ray of light is bent when it enters a material.
a.Index of reflection
b. Index of refraction
c.Indices of Refraction
d.Indices of Reflection
summative poneed na po ngayon help po wag sasagot kung hindi alam ang sagot
a. aluminum
b.plastic
c. rubber
d. steel
27. Among solids, the most rigid would transmit sound faster. On which material does sound travel faster?
a.glass
b.metal
c.rubber
d. wood
28. A pencil seems broken when it is inside a clear glass filled with clear water because of _____. *
a. Interference
b. Reflection
c. Refraction
d. Optical illusion
29. Light travels at the speed of _____ in a vacuum.
a. 100 000 000 m/s
b. 300 000 000 m/s
C. 400 000 000 m/s
d. 200 000 000 m/s
30. It is the measure of how much a ray of light is bent when it enters a material.
a.Index of reflection
b. Index of refraction
c.Indices of Refraction
d.Indices of Reflection
summative poneed na po ngayon help po wag sasagot kung hindi alam ang sagot
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26.D steel
steel
Particles that return to their resting position quickly are ready to move again more quickly, and thus they can vibrate at higher speeds. Therefore, sound can travel faster through mediums with higher elastic properties (like steel) than it can through solids like rubber, which have lower elastic properties.
27.C rubber
Sound waves travel fastest in solids (compared to liquids and gases) because solids are more dense. The fastest which sound can move is when it is moving through a vacuum. If all other factors are equal, a sound wave will travel fastest in the most dense materials.
28.C refraction
refraction
As you sight at the portion of the pencil that was submerged in the water, light travels from water to air (or from water to glass to air). This light ray changes medium and subsequently undergoes refraction. As a result, the image of the pencil appears to be broken.
29.B 300 000 000 m/s
approximately 300,000 kilometers per second
Light travels at approximately 300,000 kilometers per second in a vacuum, which has a refractive index of 1.0, but it slows down to 225,000 kilometers per second in water (refractive index of 1.3; see Figure 2) and 200,000 kilometers per second in glass (refractive index of 1.5).
30.B index of refraction
refractive index, also called index of refraction, measure of the bending of a ray of light when passing from one medium into another.
Power
Work
Energy
Force
12. Kinetic energy is the energy of a moving object, whereas potential energy is_____. *
energy in position
energy at rest
Stored energy
All of these
13. A baby carriage is sitting at the top of a hill that is 21 m high. The carriage with the baby weighs 12 N. The carriage has _____ potential energy. Calculate it. (PE=mgh) / (PE= WH) *
1.75J
33 J
252 J
2469.6 J
kinetic energy to kinetic energy
kinetic energy to potential energy
potential energy to kinetic energy
potential energy to potential energy
15.Who among the group members has the highest energy output? *
Bella
Elijah
Troy
Mae
a. weight and height
b. height and time
c. work and time
d.weight and energy
17. Who among the group members has the lowest energy output? * 1 point Bella Troy Elijah Mae 18. Sound wave is a mechanical wave because _____. *
a. it propagates well in a vacuum.
b. it needs a medium to propagate.
c.it needs only air molecules to propagate.
d. it does not need a medium to propagate.
a. Air at 40°C
b. Aluminum
c. Lead
d. Gold
20. Which material is widely used in making telephone wires?
a. Aluminum
b. Copper
c. Lead
d. Gold