Two very narrow slits are cut close to each other in a large piece of cardboard. They are illuminated by monochromatic red light. A sheet of white paper is placed far from the slits, and a pattern of bright and dark bands is seen on the paper. Describe how a wave behaves when it encounters a slit, and explain why some regions are bright while others are dark.

Compare and contrast the Moon and the moons of other planets.

A _______ tumor tends to spread to other regions of the body.

The shortest side of a right triangle measures $8 \mathrm{~cm}$. The lengths of the other two sides are consecutive odd integers. Find the lengths of the other two sides.

What other types of amplifiers are you familiar with?

The hypotenuse of a right triangle has length 20 cm. The sum of the lengths of the other two sides is 28 cm. Find the lengths of the other two sides of the triangle...

Standing on Earth, gravity exerts a downward force on you, yet you don't fall toward the center of the planet. a. Name the other force that acts on you and keeps you in equilibrium. b. What is the direction of the other force? c. What do you know about the strength of this other force?

What are three consumption patterns or other aspects of your lifestyle that directly add greenhouse gases to the atmosphere? Which, if any, of these habits would you be willing to give up in order to help slow projected climate disruption? Write up an argument that you could use to convince others to do the same. Compare your answers to those of your classmates.

Give an example of roundworms interacting with other organisms.

What is the probability of a child having type AB blood if one of the parents is heterozygous for type A blood and the other is heterozygous for type B? What other genotypes are possible in this child?

(a) Show that the asymptotes of the hyperbola

$$x ^ { 2 } - y ^ { 2 } = 5$$

are perpendicular to each other. (b) Find an equation for the hyperbola with foci

$$( \pm c ,0 )$$

and with asymptotes perpendicular to each other.

The nearest star other than the Sun is about 40 trillion km away. About how many miles away is the nearest star other than the Sun?

Are the expressions $-a+b$ and $a+(-b)$ opposites of each other? Why or why not?

Two dogs, initially separated by 500.0 m, are running towards each other, each moving with a constant speed of 2.5 m/s. A dragonfly, moving with a constant speed of 3.0 m/s, flies from the nose of one dog to the other, then turns around instantaneously and flies back to the other dog. It continues to fly back and forth until the dogs run into each other. What distance does the dragonfly fly during this time?