निम्नलिखित में से किस कण में कण-तरंग की दोहरी प्रकृति (द्विप्रकृति) पाई जाती 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?