Consider a cool gas placed in front of a hot light bulb. The observed spectrum of the light bulb will contain dark lines where some light has been absorbed by the gas. Those dark lines reveal the:

While goofing off at the ice skating rink, a student takes off her shoes and places each of them on the ice. her friend, a hockey player, then shoots a hockey puck at each shoe. the first puck immediately comes to rest after it collides with the left shoe. the second puck rebounds after it collides with the right shoe. if each hockey puck has the same incoming speed, which shoe has greater speed after the collision? the right shoe. both shoes have the same speed. the left shoe.

Which of the following is an example of units for speed

Because light travels in a straight line and casts a shadow, isaac newton hypothesized that light is