Find the current i1 in the following circuit where r1=r2=3ω and r3=6ω. (hint: find i2, i3 and i4, first and i1=i2 i3 i4. Voltage on the wire at the top is 24v higher than that at the bottom).

What is relative velocity? in which condition is relative velocity known by adding the velocity of the first body and that of the second body

The atoms in a nickel crystal vibrate as harmonic oscillators with an angular frequency of 2.3 × 1013 rad/s. the mass of a nickel atom is 9.75 × 10-26 kg. what is the difference in energy between adjacent vibrational energy levels of nickel? (h = 6.626 × 10-34 j • s, , 1 ev = 1.60 × 10-19 j)

At what time will the interfering waves have an amplitudeof zero?