3 years ago

A photon with a wavelength of 2.29 × 10^–7 meter strikes a mercury atom in the ground state.

1 answer:

8 0

The photon can be absorbed and the energy of the photon is exactly equal to the energy-level difference between the ground state and the level d.

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Ionic compounds form between elements that are metals and<br> elements that are

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Answer:

nonmetals

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Ionic compounds generally form between elements that are metals and elements that are nonmetals. For example, the metal calcium (Ca) and the nonmetal chlorine (Cl) form the ionic compound calcium chloride (CaCl2).

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3 years ago

One kind of slingshot consists of a pocket that holds a pebble and is whirled on a circle of radius r. The pebble is released fr

Debora [2.8K]

Answer:

θ=142.9°

Explanation:

d=1 *r

angle ϕ= 37.1°

the line connecting pebble and target should be tangent to a circle so

cos(180-ϕ-θ)= $\frac{r}{d}$ = $\frac{1}{1}$

∴ θ=180-ϕ- $cos^{-1} (\frac{1}{1} )$

θ= 180-37.1-0

θ=142.9°

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3 years ago