If the spacing between the lines is 2000 nm, and the angle of the second-order ray is 48.5°, what is the wavelength of the light? a. 1500 nm b. 1000 nm c, 750 nrn d. 2000 nnm e. we can't determine the wavelength from the information.

Scientists use laser range-finding to measure the distance to the moon with great accuracy. a brief laser pulse is fired at the moon, then the time interval is measured until the "echo" is seen by a telescope. a laser beam spreads out as it travels because it diffracts through a circular exit as it leaves the laser. in order for the reflected light to be bright enough to detect, the laser spot on the moon must be no more than 1.0 km in diameter. staying within this diameter is accomplished by using a special large-diameter laser. part a if λ = 540nm , what is the minimum diameter of the circular opening from which the laser beam emerges? the earth-moon distance is 384,000 km. express your answer to two significant figures and include the appropriate units.

Which transition by an electron will release the greatest amount of energy? oa ob oc od

How do you tell if someone actually cares about you? and just say they do?