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# Atomic and Nuclear Physics Answers

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1. Compute the force of attraction between two planets (Planet A and Planet B). The mass of Planet A is 12.34 x 1024 kg and Planet B is 364.25 x 1020 kg and the distance between them is 788,354 km.

COMPUTATION

Compute the Potential Energy of a certain object that is on Earth that is located at the top of a 100-meter building. The mass of the object is 13.7 kg.

COMPUTATION

1. An inelastic collision occurs in one dimension, in which a 15 kg block traveling at 7.6 m/s collides with a 13.2 kg block traveling at 2.5 m/s in the same direction, and they stick together. What are the velocities of the blocks immediately after the collision?

I. COMPUTATION

1. The momentum of a particle is 50 kg-m/s. If the velocity of the particle is 5 m/s, what is its mass? If the particle is located on a certain planet where the acceleration due to gravity is 5.87 m/s2, what is its weight?

Find the energy of incident photons if a 430-nm violet light is incident on a calcium photoelectrode with a work function of 2.71 eV.

Determine the work function when a 180-nm light is used in an experiment with an unknown metal, the measured photocurrent drops to zero at potential -0.08V.

Raindrops falling from thunderclouds may carry charges as high as 3.3*10-11 C/drop. According to The Rayleigh limit; what is the minimum size of drop

Compton Scattering. Find the scattered wavelength for a 71 picometer x-ray is incident on a calcite target. What is the maximum shift that can be observed in this experiment?

A broken leg about 1.2kg in mass receives an equivalent dose of 0.40 mSv. (For x-rays RBE =1.0 Sv/Gy or 1.0 rem/rad)

(a) Find the equivalent dose in mrem

(b) What is the absorbed dose in mrad?

(c) What is the absorbed dose in mGy?

(d) If the x-ray energy is 50keV, how many x-ray photons are absorbed?

Find the scattered wavelength for a 71 picometer x-ray is incident on a calcite target. What is the maximum shift that can be observed in this experiment?

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