एक चालित आवर्ती दोलक (driven harmonic oscillator) में अवशोषित औसत शक्ति किस आवृत्ति पर अधिकतम होती 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?