Science grade 8 does anyone know this answer to this science question? select the sentence that is true about how a person changes the pitch of sounds when singing. a person stretches the vocal cords to produce higher-frequency sound waves. a person stretches the vocal cords to produce lower-frequency sound waves. a person relaxes the vocal cords to produce higher-frequency sound waves. a person relaxes the vocal cords to produce lower-frequency sound waves.

Which of the following nuclei would be the least stable a 2 protons, 2 neutrons b 1 proton 1 neutron c 1 proton 3 neutrons d 1 proton 2 neutrons

Listenbase your answer to the question on the information below.nuclear radiation is harmful to living cells, particularly to fast-growing cells, such as cancer cells and blood cells. an external beam of the radiation emitted from a radioisotope can be directed on a small area of a person to destroy cancer cells within the body.cobalt-60 is an artificially produced radioisotope that emits gamma rays and beta particles. one hospital keeps a 100.0-gram sample of cobalt-60 in an appropriate, secure storage container for future cancer treatment.which choice represents the correct product for the beta decay of the co-60? fe-60ni-60fe-61ni-61

Atoms contain subatomic particles called protons and neutrons. when these protons and neutrons spilt, a lot of energy is released