In two H atoms A and 13 the electrons move around the nucleus in circular orbits of radius r and 4r respectively. The ratio of the times taken by them to complete one revolution is

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#Question id: 18551

#XL - R Botany

Lime, CO, and SO2 is used for purification of juice of. 

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#Question id: 18552

#XL - R Botany

Palm sugar is obtained from

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#Question id: 18553

#XL - R Botany

Sugarcane research institute, Coimbatore has developed red rot resistant varieties as

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#Question id: 19494

#XL - P Chemistry

Neutron was discovered by ————–

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#Question id: 19495

#XL - P Chemistry

The nucleus of the atom consists of ————–

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#Question id: 19496

#XL - P Chemistry

The radius of an atomic nucleus is of the order of————–