A student measures the volume of a solution to be 0.03010 L. How many significant digits are in this measurement?

Which of the following is equal to 623? 

Which portion of the electromagnetic spectrum has the highest frequency of the given choices?

A certain element is composed of two isotopes, having the mass and abundance shown below.  What is the average atomic mass unit (amu) for this element?   Mass Abundance Isotope 1: 35.0 amu 75.8% Isotope 2: 37.0 amu 24.2% (Hint: Atomic mass = Σ(mass of isotope)(abundance of isotope))

An atom has atomic number 92 and mass number 238. Which of these is an isotope of this atom?

A circle current loop 20 cm radius carries a [I] A current. The loop is in a [B] T uniform magnetic field. The axis of the loop, perpendicular to the plane of the loop, is 60 degrees away from the field direction. What is the magnitude of the torque on the current loop?

A proton travels between the two parallel charged plates shown in the figure. The plates are separated by 1.0 cm and are charged by a [V] V battery. There is a magnetic field strength [B] T which allows the proton to pass between the plates without being deflected. What is the speed of this proton in m/s? Ignore gravitational force.    

A circle current loop 20 cm radius carries a current. The loop is in a [B] T uniform magnetic field. The axis of the loop, perpendicular to the plane of the loop, is 60 degrees away from the field direction. The torque on this loop is [T]

On July 20, 2012 ______ entered a movie theater during the midnight showing of the movie The Dark Knight Rises and shot into the audience.

________was a 23 year old Virginia Tech student that opened fire and took the lives of 32 people and then took his own life.