Atomic and Nuclear Physics Answers

Calculate the two possible angles the electron spin vector S makes with respect to a magnetic field direction

A mad scientist has been apprehended in their secret laboratory in some remote woods. The place is severely contaminated with polonium-210 which has a half-life of 138.4 days. A geiger counter used on scene shows 140 decays per second. 2 decays per second would be considered safe / equivalent to background radiation. How long until the site is safe?

Does positron emission is strong or weak interaction?

The ⁶₁₄𝐶 isotope has a half-life of 5730 yr. If at some time a sample contains 1.00 x 1022 carbon-14 nuclei, what is the activity of the sample? 

The sun has a radiated power of 3.9 · 1026 W, a surface temperature of 5800 K and a radius of 6.96 · 108 m. Examine whether the sun radiates like a black body?

If one photon of light is known to have energy 3.33×10^-19J, is it visible?

An alpha particle is hit at a gold nucleus so that it reflects back at 180 degrees. What is the maximum acceleration of the alpha particle as it reaches the point of minimum separation from the nucleus. Assume that the gold nucleus remains at rest.

Speed of alpha particle is 1.74 * 10^7 m/s

mass of an alpha particle is 6.64 * 10^-27 kg

Ar of Gold= 79

A forklift uses a force 300N to move a crate 10 meters. How much work was done?

A research project you are working on requires that an electron have a wave function represented by

𝜓(x) = Ae^−bx for x ≥ 0Ae^+bx for x < 0

The experiment requires that the electron have a 98.0% chance of being within a distance of a = 14.5 cm

 from x = 0,

 on either side of this center point. From this information, you need to determine numerical values for b (in m⁻¹) and the normalization constant A (in m^−1/2) for the wave function.

A 100-N force has a horizontal component of 80 N and a vertical component of 60 N. The force is applied to a cart on a level frictionless floor. The cart starts from rest and moves 2.0 m horizontally along the floor due to this force. What is the cart's final kinetic energy ?