An open organ pipe having a fundamental frequency (n) is in unison with a vibrating string. If the tube is dipped vertically in water so that 75% of the length of the tube is inside the water, then the ratio of the fundamental frequency of the air column of the dipped tube to that of the string will be (Neglect end corrections):

Which Indian independence movement leader was primarily known for his philosophy and practice of non-violent civil disobedience?

Who gave the call for 'Do or Die' during the Quit India Movement in 1942?

Which of the following revolutionary pairs were imprisoned together in Cellular Jail and faced harsh conditions, contributing significantly to the Indian independence movement?