A golf ball including a spherical body, first regions, and second regions. The spherical body includes a core layer and a cover layer made from a synthetic resin covering the core layer. Dimples are formed in a surface of the cover layer. First regions that are electrically conductive are formed on a surface of the spherical body. The first regions are formed on a spherical surface having a center of the spherical body as a center. The first regions are positioned at six vertices of an imaginary regular hexahedron such that the vertices are positioned on the surface of the spherical body and, thus, six of the first regions are formed. The second regions are formed in areas of the surface other than where the first regions are formed. The second regions have a radio wave reflectance lower than that of the first regions.

A golf ball including a spherical body, first regions, and second regions. The spherical body includes a core layer and a cover layer made from a synthetic resin covering the core layer. Dimples are formed in a surface of the cover layer. First regions that are electrically conductive are formed on a surface of the spherical body. The first regions are formed on a spherical surface having a center of the spherical body as a center. The first regions are positioned at six vertices of an imaginary regular hexahedron such that the vertices are positioned on the surface of the spherical body and, thus, six of the first regions are formed. The second regions are formed in areas of the surface other than where the first regions are formed. The second regions have a radio wave reflectance lower than that of the first regions.

A golf ball includes a core and a cover. A difference (FB.sub.2FC.sub.2) between a secondary natural frequency FB.sub.2 of the golf ball and a secondary natural frequency FC.sub.2 of the core is not less than 80 Hz and not greater than 420 Hz. The golf ball having a sum (FB.sub.2+FC.sub.2) of not less than 4000 Hz is preferable. Preferably, the FC.sub.2 is not less than 1800 Hz and not greater than 2500 Hz. Preferably, the FB.sub.2 is not less than 2000 Hz and not greater than 2800 Hz. Preferably, an amount of compressive deformation Dc is 2.30 mm to 3.90 mm. Preferably, an amount of compressive deformation Db is 1.80 mm to 3.30 mm. Preferably, a thickness Tc is 0.80 mm to 2.10 mm. Preferably, a Shore D hardness Hc is not less than 52 and not greater than 65.

A golf ball 2 includes a core 4 and a cover 6. A difference (FB.sub.2FC.sub.2) between a secondary natural frequency FB.sub.2 of the golf ball 2 and a secondary natural frequency FC.sub.2 of the core 4 is greater than 420 Hz and not greater than 760 Hz. Preferably, a sum (FB.sub.2+FC.sub.2) is not greater than 5200 Hz. Preferably, the FC.sub.2 is not less than 1700 Hz and not greater than 2400 Hz. Preferably, the FB.sub.2 is not less than 2250 Hz and not greater than 3050 Hz. Preferably, an amount of compressive deformation Dc of the core 4 is 2.30 to 3.90 mm. Preferably, an amount of compressive deformation Db of the golf ball 2 is 1.80 to 3.30 mm. Preferably, a thickness Tc of the cover 6 is 1.00 to 2.30 mm. Preferably, a Shore D hardness Hc of the cover 6 is 54 to 67.

A golf ball including a spherical body, first regions, and second regions. The spherical body includes a core layer and a cover layer made from a synthetic resin covering the core layer. Dimples are formed in a surface of the cover layer. First regions that are electrically conductive are formed on a surface of the spherical body. The first regions are formed on a spherical surface having a center of the spherical body as a center. The first regions are positioned at six vertices of an imaginary regular hexahedron such that the vertices are positioned on the surface of the spherical body and, thus, six of the first regions are formed. The second regions are formed in areas of the surface other than where the first regions are formed. The second regions have a radio wave reflectance lower than that of the first regions.

A golf ball 2 includes a core 4 and a cover 6. A value V calculated by the following mathematical formula is equal to or less than 1080 Hz.

V=NF(2)22/3*NF(2)1

In the mathematical formula, NF(2)1 represents a secondary natural frequency of the core 4, and NF(2)2 represents a secondary natural frequency of the golf ball 2. A difference (H1sH1o) between a Shore C hardness H1s at a surface of the core 4 and a Shore C hardness H1o at a central point of the core 4 is equal to or greater than 10. An amount of compressive deformation Df1 of the core 4 is equal to or greater than 4.1 mm.