While scuba diving with some friends, Deshawn notices that the air bubbles exhaled by his friends increase in size as they get c
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Answer:
a) the longest wavelength of the light that will eject electrons from the silicon surface is 258.7891 nm
b) maximum kinetic energy will electrons reach the anode is 0.5098 eV
Explanation:
Given:
Wavelength range = 141-295 nm
Potential of 3.5 V
For the silicon, the work function is Φ = 4.8 eV = 7.68x10⁻¹⁹J
Questions:
a) What is the longest wavelength of the light that will eject electrons from the silicon surface, λ = ?
b) With what maximum kinetic energy will electrons reach the anode,
a) The longest wavelength that will eject electrons:
Here
h = Planck's constant = 6.625x10⁻³⁴J s
c = speed of light = 3x10⁸m/s
Substituting values:
b) The maximum kinetic energy (one electron):
Now, you need to calculate the potential difference:
Here
e = charge of electron = 1.6x10⁻¹⁹C
Substituting:
Now, the maximum kinetic energy of the electrons:
Kmax = 4.0098 - 3.5 = 0.5098 eV
Explanation:
It is given that,
Initial speed of a golfer, u = 29 m/s
If it travels the maximum possible distance before landing. It means that it is projected at an angle of 45 degrees.
(a) We need to find the time spent by the ball in the air. It can be calculated by using second equation of motion.
Here,
a = -g
s = 0 (it is displacement and it is equal to 0 as the ball lands on the green).
So,
So, it will take 4.184 seconds in the air.
(b) let x is the longest hole in one that the golfer can make if the ball does not roll when it hits the green. It can be given by :
Hence, this is the required solution.