एक आवर्ती तरंग द्वारा प्रति सेकंड पूरे किए गए चक्रों की संख्या को _______ के रूप में परिभाषित किया जाता है।

The 'Drain of Wealth' theory was propounded by which Indian nationalist leader?

Which event is considered the turning point in Mahatma Gandhi's leadership in the Indian independence movement?

Which African leader is known for his non-violent opposition to colonial rule?