Radius Diameter

Which combination of lens parameters will give the brightest image of a faint comet?

• Large diameter, short focal length

• Small diameter, short focal length

• Small diameter, long focal length

• Large diameter, long focal length

Which atom has the largest atomic radius?

• potassium

• rubidium 

• francium

• cesium

What is the relationship between the radius and diameter of a circle?

• The radius is half the diameter

• The radius is twice the diameter

• The radius is equal to the diameter

• The radius is three times the diameter

If the diameter of a circle is 10 cm, what is the radius?

• 5 cm

• 10 cm

• 15 cm

• 20 cm

Which formula correctly represents the relationship between radius (r) and diameter (d) of a circle?

In a scientific experiment, if the diameter of a spherical cell is measured to be 6 micrometers, what is its radius?

• 3 micrometers

• 6 micrometers

• 9 micrometers

• 12 micrometers

A wheel has a diameter of 1 meter. What is the radius of the wheel?

• 0.5 meters

• 1 meter

• 1.5 meters

• 2 meters

If the radius of a circle is doubled, what happens to the diameter?

• It doubles

• It halves

• It remains the same

• It triples

Which of the following statements is true about the radius and diameter of a circle?

• The diameter is twice the radius

• The diameter is half the radius

• The diameter is equal to the radius

• The diameter is three times the radius

In terms of radius, how can the diameter of a circle be expressed?