What is the frequency of light reflected from a green leaf that has a wavelength of 3.9 x 10 -9cm?

Calculate the energy possessed by a single photon of electromagnetic radiation that has a wavelength of 2.857 x 10- 8 m.

Calculate the wavelength, in meters, of an X-ray with a frequency of 2.61 x 1018 s-1.

What is the energy of a photon from the violet portion of the sun's light if it has a frequency of 7.230 x 1014s -1?

A photon of red light has an energy of 2.88 x 10 -19 J. What is the wavelength, in centimeters, of this photon?

Determine the frequency of a microwave that has a wavelength of 8.72 x 10 -2 m.

the electronic configuration of an atom with eight electrons is 1s²2s²2p⁴. the orbital diagrams are shown in the figure.

as per the hunds rule:

1. electrons tend to avoid being in the same orbital as per as practicable.

2. electrons in different orbitals of the same energy will have their spin parallel.

this can be illustrated from the multiplicity of the orbitals of the atom. as there are four electrons in the p orbital and p orbital has 3 sub-shells. the electrons can be fed in different ways as shown in the figure but the correct orbital diagram will be as per the hunds rule.

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.

answer: e.   sour taste

explanation: acids are those substances which dissociates in water to give ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. acids are sour in taste. example: hcl

bases are those substances which dissociates in water to give ions or accepts ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. bases are bitter in taste. bases are slippery in nature.