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A photon has an energy of 1.0 MeV. Calculate the frequency associated with this photon energy. State an appropriate unit in your answer.

The energy contained in a photon is given by the formula E = hf, where h is the Planck constant and f is the frequency of the photon. Since h = 4.1 10 −15 eV s, f = E/h = 1.0 10 3 eV / (4.1 10 −15 eV s) = 2....
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Answered by Giovanni N. • Physics tutor
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What is the angular velocity of a car wheel which diameter is d = 15 mm if the car velocity is of 120 km/h?

First, we change the units of the datas: v=120 km/h = 120 km/h x 1 h / 3600 s x 1000 m /1 km = 33.333 m / s d=15 mm = 15x10 -3 m Using the formula of the angular velocity: w=v/r = 33.33 m/s / 15x10 -3 m= 222...
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Answered by Lucia A. • Physics tutor
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A transmitter from a researcher's boat sends a signal to the seabed of waves speed 300m/s and it takes 5 seconds for the signal to return back to the boat. Calculate the depth of the sea there.

distance=speed*time distance=300*5 =1500 1500/2 (as signal travels back and forth)=750m
TA
Answered by Tani A. • Physics tutor
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Calculate the kinetic energy of a proton moving at 95% of the speed of light. (c = 3x10^8 m/s, m_p = 1.67x10^-27 kg) [4 marks]

KE = 0.5mv 2 [1] v = 3x10 8 * 0.95 = 2.85x10 8 [1] KE = 0.5 * 1.67x10 -27 * (2.85x10 8 ) 2 [1] KE = 6.782 x10 -11 J [1]
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Answered by Tom F. • Physics tutor
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What is the difference between plastic and elastic collision?

An elastic collision is a collision where objects will bounce after they hit each other. For example balls in a pool game bounce after heating each other. For an elastic collision, Mechanical Energy Kinetic ...
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Answered by Eugeniu D. • Physics tutor
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