What is an alpha particle?
a. A hydrogen atom.
b. A helium atom.
c. A hydrogen atom without its electrons (and therefore having one unit of positive charge).
d. A helium atom without its electrons (and therefore having two units of positive charge).
e. A deuterium nucleus (with one proton and one neutron).
d
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For a simple harmonic oscillator, which of the following pairs of vector quantities can't both point in the same direction? (The position vector is the displacement from equilibrium.)
1.position and velocity 2.velocity and acceleration 3.position and acceleration
In the Doppler effect it is important to distinguish between
A) frequency and speed. B) speed and velocity. C) speed and acceleration. D) distance and displacement.
What happens to the properties of elements across any period of the periodic table?
A) The elements tend to become more metallic in nature since they are increasing in atomic number. B) The elements get much larger in size because of the addition of more protons and electrons. C) The properties of the elements gradually change across any period of the periodic table. D) All of the above are true.
Why does one cycle of lunar phases take 29.53 days even though the Moon orbits Earth in 27.32 days?
What will be an ideal response?