Atomic Physics » Exercise - 124. The value of 1 electron volt = ............... J. (a) 1.6 x 1019 J (b) 1.6 x 10–19 J (c) 1.6 x 1020 J (d) 1.6 x 10–20 J
Waves » Exercise - 114. A human being can hear a sound of frequency ranging _______ . (a) 20 Hz to 20 kHz (b) Below 20 Hz (c) Above 20 Hz (d) None of these