Andrew watches his food as it cooks in the microwave. He wonders how something he cannot see can make his food so hot. He looks at an electromagnetic spectrum diagram to help him find his answer. Why is Andrew unable to see the microwaves that cook his food?

Which of the following are considered noble gases? a. bromine b. neon c. argon d. chlorine

Suppose a diode consists of a cylindrical cathode with a radius of 6.200×10^−2 cm , mounted coaxially within a cylindrical anode with a radius of 0.5580 cm . the potential difference between the anode and cathode is 260 v . an electron leaves the surface of the cathode with zero initial speed (v initial=0). find its speed vfinal when it strikes the anode.

Abaseball is thrown from the outfield toward the catcher. when the ball reaches its highest point, which statement is true? (a)its velocity is not zero, but its acceleration is zero. (b) its velocity and its acceleration are both zero. (c) its velocity is perpendicular to its acceleration. (d) its acceleration depends on the angle at which the ball was thrown. (e) none of the above statements are true.