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V125BC [204]
3 years ago
13

Any ideas for the science fair? I am a 7th grader but looking for a first-place type of project.Thanks!

Physics
1 answer:
mihalych1998 [28]3 years ago
7 0
U can do what is the strongest paper towel
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An airplane flies with a constant speed of 840 km/hr. How far will go in 270 min
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How much time will elapse between seeing and hearing an event?
julia-pushkina [17]

Depends on how far away the event is and what the temperature is as this affects the speed of sound.

For example, let's say you're 600 meters away and the temperature has no affect.

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3 0
3 years ago
Calculate the wavelengths of the first five emission lines of the Balmer series for hydrogen
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Answer:

Explanation:

The Balmer series in a hydrogen atom relates the possible electron transitions down to the n = 2 position to the wavelength of the emission that scientists observe. In quantum physics, when electrons transition between different energy levels around the atom (described by the principal quantum number, n) they either release or absorb a photon. The Balmer series describes the transitions from higher energy levels to the second energy level and the wavelengths of the emitted photons. You can calculate this using the Rydberg formula.

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3 years ago
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