What wavelength? should the astrophysicist look for to detect a transition of an electron from the n=7 to the n=3 level?

How would the force of a test charge change if the electric field is doubled? The force would double. The force would decrease by half. The force would increase by a factor of four. The force would decrease by a factor of four.

The most common purpose for fracking in the U. S is to get A) petroleum B) natural gas C) geothermal energy D) mineral ores

Is it true or false that if you are sitting still right now, the net force acting on you is zero?

My trip to work is 120 miles. if i go 8 mph faster than my usual speed, i'll get to work 30 minutes earlier. how long does my trip take, in hours, if i go my usual speed?

What is the relationship between color and wavelength for light?

How do we use light in space?

What units are used for gravitational potential energy? Write the name, not the symbol.

A 7.5 kg block is placed on a table. If it's bottom surface area is 0.6m2, how much pressure does the block exert on the tabletop? A. 376.5 Pa B. 73.5 Pa C. 226.5 Pa D. 122.5 Pa

A boulder of mass 2000 kg is at the top of a cliff of height 220 m. Determine how fast the boulder will be moving when it strikes the dirt below.

Which of the following statements are true? Check all that apply. O A positive charge and a negative charge attract each other. O Electric charge is conserved. O Two positive charges attract each other. O A neutral object contains no charge.