Answer:
Explanation:
We know that energy of a photon
E =hυ = hc/λ
h = planks constant, = 6.63×10^{-34} J s
υ= frequency of the wave, c= speed of light, = 3×10^8 m/s
λ = wavelength = 3×10^{-15} m
Answer:
it will travel 69 m long consuming. it is totally wrong
Answer:
D) crystalline solid that conducts current under certain conditions
Explanation:
A semiconductor is any crystalline solid material whose electrical conductivity is intermediary between that of insulators and conductors. That is, a semiconductor does not conduct like a conductor but does more than an insulator.
Based on this, a semiconductor is said to only conduct electricity under certain conditions as opposed to conductors that do so under any condition. Example of semiconductors are silicon, carbon, antimony, arsenic etc.
Answer:
Vf = 62.61 m/s
Explanation:
Since, the truck completely stops t highest point. Therefore, from conservation of energy principle:
Kinetic Energy Lost by Truck = Potential Energy Gained by Truck
(0.5)(m)(Vf² - Vi²) = mgh
(0.5)(Vf² - Vi²) = gh
where,
Vf = final velocity = 0 m/s (since, truck finally stops)
Vi = initial velocity = ?
g = acceleration due to gravity = - 9.8 m/s² (negative sign due to upward motion)
h = Height of Ramp = (Length)(Sin θ) = (400 m)(Sin 30°) = 200 m
Therefore,
(0.5)(0² m/s - Vf²) = (-9.8 m/s²)(200 m)
Vf² = (1960 m²/s²)/(0.5)
Vf = √(3920 m²/s²)
<u>Vf = 62.61 m/s</u>