Why is the solar cycle said to have a period of 22 years, even though the sunspot cycle is only 11 years long?

O horizon is also known as

One isotope of sodium has 11 protons and 7 neutrons. What is the mass number of this isotope?

A dam produces 400 watts of electrical energy. What is the efficiency of the dam?

High frequency sound waves have a shorter wavelength and a higher A. amplitude B. pitch C. wavelength? than low frequency sound waves

An electron in an atom's orbital shell, labeled X in the model below, released enough energy to move to a different orbital shell. Which of the two orbital shells would the electron have the possibility of moving to

Which method would you use to find the volume of an irregular shaped object?

A step up transformer has a primary coil with 100 turns and a secondary coil with 25 turns if the input voltage in the primary coil is 40 volts what is the output voltage reduced to in the secondary coil A) 20 volts B) 35 volts C) 4 volts D) 10

An instrument used to measure atmospheric pressure is called a

A 200-kg boulder is 1000-m above the ground. what is its potential energy?

The law of reflection states that if the angle of incidence is 81 degrees, the angle of reflection is ___ degrees.