Adiffraction grating gives a second-order maximum at as angle of 31° for violet light (λ = 4.0 × 102 nm). if the diffraction grating is 1.0 cm in width, how many lines are on this diffraction grating? /3]

In what direction does the medium move relative to the direction of the wave? explain.

True or false when elements combine to form a mixture, the resulting chemical properties may be very different from those of the elements that make it.

Atruck driver is attempting to deliver some furniture. first, he travels 8 km east, and then he turns around and travels 3 km west. finally, he turns again and travels 13 km to his destination. what is the drivers distance