Why is it that a bell in a sealed bell jar (a) can be heard when the jar is full of air? (b) can not be heard when a vacuum is created in the jar?

Abeam of electrons with of wavelength of 7.5 x 10-6 m is incident on a pair of narrow rectangular slits separated by 0.75 mm. the resulting interference pattern is projected onto a screen 10.0 m from the slits. what is the separation of the interference maxima in the resulting interference pattern?

Choose a synonym for the underlined homonym (a word with two or more meanings). i did not expect the boat to rock so much. a. boulder c. astound b. sway d. shock

Which pair of quantities includes one quantity that increases as the other decreases during simple harmonic motion?