Answer: The correct answer is "Light has properties of both particles and waves".
Explanation:
Light shows dual nature. It behaves as particle as well as waves.
Photoelectric effect is the phenomenon in which there is an emission of the electrons when the light of the particular frequency is incident on the surface of the metal.
The particle nature of the light is shown by photoelectric effect.
Reflection: Reflection is the phenomenon in which the light wave gets reflected from the surface without getting transmitted. It bounces back from the surface.
The wave nature of the light is shown by reflection.
Therefore, the correct option is (B).
Answer:
V solids > V liquids > V gas
Explanation:
Speed of sounds depends of the type of material in which it travels, this phenomenon may be determined by the following formula:
V = √(B/ρ)
Where:
V= speed of sound
B= represent the medium hardness, this coefficient is expressed in Pascal units. The bigger the number, the hardest the material and sound travels faster. This is because in hardest material, particles are closer together so sound travels faster
ρ= density, for this case, for a high density value, sound travels slower
Both factors (B and P) should be considering when calculating the speed of sound
For example, for iron, B has a high value so sound travels faster, but also has a high density (this would make sound travels slower), but for this type of materials, B is much more bigger that P, hence V will be always a high number
Actually : V solids > V liquids > V gas
ρ is also important in certain circumstances, for example, in a gas, when temperature rises, P decreases, for which speed is faster in hot air
Solid medium helps sound waves to travel the fastest since the molecules inside a solid are closer to one another, allowing better transmission.
Explanation:
Talking about the motion of sound waves through the three phases of mediums (solid, liquid and gas), sound waves chose to be the fastest while travelling through the solid media.
Because in solids, the molecules are stacked closely to one another, allowing the transmission of sound waves faster as compared to the liquids or gases. In fact in air, the sound waves find clumsy to travel.
Sound waves travel about 17 times faster in steel than through air. Although there are always some exceptions yet, most of the solids provide better transmission of sound waves as compared to other mediums.
elastic potential energy
B.
gravitational potential energy
C.
kinetic energy
D.
chemical energy
Answer:
The answer is A.
Explanation:
It's correct in Аpex
of 39.2 m/s?
Answer:
304.89m
Explanation:
Given
acceleration a = 2.52m/s²
final speed v = 39.2m/s
initial speed = 0m/s (car accelerates from rest)
Using the equation of motion below to get the distance of Doc brown from Marty;
v² = u²+2as
substitute the given parameters
39.2² = 0²+2(2.52)s
1536.64 = 0+5.04s
divide both sides by 5.04
1536.64/5.04 = 5.04s/5.04
rearrange the equation
5.04s/5.04 = 1536.64/5.04
s = 304.89m
Hence He and Marty must stand at 304.89m to allow the car to accelerate from rest to a speed of 39.2 m/s?
Answer:
as you increase in altitude, air pressure decreases