Calculate "de broglie" wavelength for each of the following, and use your numerical answers the to explain why macroscopic (large) objects are not ordinarily discussed in terms of their "wave-like" properties. a. an electron moving at .90 times the speed of light.
b. a 150-g ball moving at a speed of 10.m/s

a.

b.

Explanation:

The de Broglie wavelength can be found by the following equation:

Here:

is the de Broglie wavelength (in m);

is the Planck's constant, ;

is mass (in kg);

And the speed of light:

The fraction of the speed of light is:

Substituting into the equation:

b. Similarly, here we have:

And the velocity of:

We obtain:

Notice that the wavelength of a large object is smaller by a fraction of:

This means the de Broglie wavelength of a macroscopic object is negligible compared to the wavelength of a microscopic object.

in 1783 cavendish was working with his hydrogen gas and found that when he burned it and condensed the vapor it was water. this was very significant since it disproved the greek theory of elements completely since water was not a simple substance but the product of two gases. it was lavoisier who hearing of the experiment gave cavendish's gas the name hydrogen ("water-producer") and added that hydrogen burned by combining with oxygen and that water was a hydrogen-oxygen combination.

explanation:

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