2. Two of the stable isotopes of mercury are 198Hg and 202Hg. These isotopes emit slightly different wavelengths of light, 546.07532nm and 546.07355nm, respectively. To identify which isotopes are included in a sample of mercury, we can shine the light on a diffraction grating with a screen 4m away. How far apart are the first-order bright fringes on the screen if the diffraction grating has 4,000 lines per centimeter

Two forces produce equal torques on a door about the door hinge. the first force is applied at the midpoint of the door; the second force is applied at the doorknob. both forces are applied perpendicular to the door. which force has a greater magnitude?

Does heating a metal wire increase or decrease its electrical resistance? why?

Asled is being held at rest on a slope that makes an angle θ with the horizontal. after the sled is released, it slidesa distance d1 down the slope and then covers the distance d2 alongthe horizontal terrain before stopping. find the coefficient ofkinetic friction μk between the sled and the ground, assumingthat it is constant throughout the trip. find the coefficient of kinetic frictionμk. express your answer in terms of someor all of the variables d1, d2, and θ.