A leaf electroscope is a device that indicates the existence of electric charge on an object. The leaves spread apart when an object is brought near or touches the electroscope. What observation would suggest that the object touched the electroscope? Group of answer choices

The leaves remained apart after the charged object was removed.

The leaves slowly came back together after the charged object was removed.

The leaves spread apart a lot when the charge was brought near the electroscope.

No observation could help determine if the charged object touched the electroscope.

1.)the isotope cobalt-60 has a nuclear mass of 59.933820 u calculate the mass defect of cobalt-60 using the following information. mass of proton: 1.007825 u mass of neutron: 1.008665 u 1 u = 931.5 mev 2.)the isotope cobalt-60 has a nuclear mass of 59.933820 u calculate the binding energy of cobalt-60 using the following information. mass of proton: 1.007825 u mass of neutron: 1.008665 u 1 u = 931.5 mev 3.)the isotope cobalt-60 has a nuclear mass of 59.933820 u calculate the binding energy per nucleon of cobalt-60 using the following information. mass of proton: 1.007825 u mass of neutron: 1.008665 u 1 u = 931.5 mev