A car, a bicycle, a bus, and a motorcycle are moving parallel to each other on a road. Each vehicle is traveling at the same spe
1 answer:
Answer:
The <u>bus </u>will have the highest kinetic energy, while the <u>bicycle </u>will have the lowest kinetic energy.
Explanation:
The energy possessed by a body due to motion is known as kinetic energy. It depends upon the mass of a body and its speed.
It is given that a car, a bicycle, a bus and a motorcycle are moving parallel to each other at the same speed.
Since, the speed is same for all the vehicles, the kinetic energy will depend on the mass.
Mass of a bus is greatest and of a bicycle is the smallest. Thus, kinetic energy of bus would be highest and of the bicycle -lowest.
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Answer:
Ф = 2.179 eV
Explanation:
This exercise has electrons ejected from a metal, which is why it is an exercise on the photoelectric effect, which is explained assuming the existence of energy quanta called photons that behave like particles.
E = K + Ф
the energy of the photons is given by the Planck relation
E = h f
we substitute
h f = K + Ф
Ф= hf - K
the speed of light is related to wavelength and frequency
c = λ f
f = c /λ
Φ =
let's reduce the energy to the SI system
K = 0.890 eV (1.6 10⁻¹⁹ J / 1eV) = 1.424 10⁻¹⁹ J
calculate
Ф = 6.63 10⁻³⁴ 3 10⁸/405 10⁻⁹ -1.424 10⁻¹⁹
Ф = 4.911 10⁻¹⁹ - 1.424 10⁻¹⁹
Ф = 3.4571 10⁻¹⁹ J
we reduce to eV
Ф = 3.4871 10⁻¹⁹ J (1 eV / 1.6 10⁻¹⁹ J)
Ф = 2.179 eV