An electron in an atom falls from an energy of 10 eV to an energy level of 3 eV.

Question

An electron in an atom falls from an energy of 10 eV to an energy level of 3 eV. To do so it has to give off a photon of light. The energy of this photon will be:
13 eV
7 eV
10 eV
3 eV



A photon behaves like a wave when:
traveling between the source and receptor
when emitted by atoms
when detected at a receptor
all of the above
none of the above



Suppose we have a material whose molecules cannot absorb photons of light for more than a very short time. This material should be:
soundproof
transparent
opaque
electrically conducting
magnetic

Explanation / Answer

7 eV all of the above electrically conducting

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