Calculate the De Broglie wavelength of an electron in your TV picture tube if it is accelerated by 45000 V .

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Two polarizers are oriented at 40∘ to each other and plane-polarized light is incident on them. if only 16 percent of the light gets through both of them, what was the initial polarization direction of the incident light?

If a simple machine reduces the strength of a force, what must be increased?