Which of the following types of spectra have dark lines?

a. emission spectra

b. absorption spectra

c. continuous spectra

d. noncontinuous spectra

Why is the wavelength of a moving soccer ball not detectable to the naked eye?

Cabbage juice can be used as a pH indicator. Using the above chart, choose all of the statements that are correct

Bernice draws an oxygen atom. She draws a small circle for the nucleus. Inside of the circle, she draws plus signs for protons and dots for neutrons. Around the nucleus she uses minus signs to represent electrons.

Keiko builds a transformer in the lab, but it does not decrease the voltage as much as she needs. What should Keiko change to further reduce the voltage?

When does the new moon occur

What is the total number of atoms in the following formula? CaBr2

A lifeguard on a beach observes that waves have a speed of 7 m/s and a distance of 4.6m between wave crests. what is the period of the wave motion?

4. A car of mass 2000 kg is traveling at 45 m/s when the driver spots a policeman anead. i ne univer apprivo the brakes lightly for 3.0 seconds until he slows down below the speed limit. If the average force applied by the brakes was 1.

When does a scientist create the conclusion?

When using a simple machine, the force you must overcome. A simple machine usually multiplies the effort force to exceed the this. Example: Lucy lifts a sack of potatoes using a pulley. The weight of the sack of potatoes is this.