A car starts from rest and travels for t1 seconds with a uniform acceleration a1. The driver then applies the brakes, causing a
1 answer:
Explanation:
It is given that,
Initially the car is at rest and travels for t₁ seconds with a uniform acceleration a₁. The driver then applies the brakes, causing a uniform acceleration a₂, If the brakes are applied for t₂ seconds.
We need to find the speed of the car just before the beginning of the braking period.
Using the formula of acceleration. It is given by :
u = 0
So, just before the beginning of the braking period the speed of the car is . Hence, this is the required solution.
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The wavelength of the light beam required to turn back all the ejected electrons is 497 nm which is option (b).
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.....(1)
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is the stopping potential and e is the charge of the electron given by
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It is given that work function (Ф) of monochromatic light is 2.50 eV.
Einstein photoelectric equation is given by:
....(2)
where K.E(max) is the maximum kinetic energy.
Substituting (1) into (2) , we get
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where Speed of light, and Planck's constant ,
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