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A uni student is listening to Top 40 Music on her FM radio, tuned into a wavelength 3.02 m. Convert this value into a frequency, in MHz.

Use the speed of light, c = 3.00 x 108 ms-1.

Give your answer to 3 significant figures. Do not enter units!

For large or small numbers, use scientific notation, for example 1.23E-4

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Police often monitor traffic with K-band radar guns, which operate in the microwave region, for example at 29.389 GHz. (Note that 1GHz = 109Hz). Find the wavelength in of the radiation and report this in nm. (Note that 1nm = 10-9m).

Give your answer to 3 significant figures. Do not enter units!

For large or small numbers, use scientific notation, for example 1.23E-4

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Sodium emits light of wavelength 690 nm when heated in a flame. What is the frequency of this light?
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If a hydrogen atom is excited into the n = 4 state, how many transitions from this energy level are possible by emitting electromagnetic radiation?
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Match the name of the quantum number with its symbol.

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An electron in an H atom is excited to an energy level of -8.72 x 10-20 J.  What energy level does this correspond with?
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Chromium metal has a binding energy of 7.21 x 10-19 J for certain electrons. What is the photon frequency needed to eject electrons with 2.2 x 10-19 J of energy?
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O persoană cu un dispozitiv mobil Android ține apăsat butonul de pornire și butonul de reducere a volumului până când dispozitivul se oprește. Apoi, persoana pornește din nou dispozitivul. Ce făcea această persoană dispozitivului?

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În SO Linux, starea în care procesul așteaptă în vederea realizării unei operaţii de intrare/ieşire.

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Позначте речення, що містить омоніми

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