Electrons are accelerated by 844 V and are reflected from a crystal. If the first-order reflection maximum occurs when the glancing angle is 58°, the interplanar spacing in the crystal is approximately:

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?