I. Moon. II. Sun. III.street light. IV. stars. Which of these above is a natural source of light?

A progressive wave is represented by y=10Sin(1000?t??x34) y = 10 Sin ( 1000 ? t ? ? x 34 ) . two layers of the wave separated by 153cm have a phase differenc...

Calculate the e.m.f of the cell in the above circuit if its internal resistance is negligible.

A near sighted student has a near point of 0.1m and a focal length of 5.0cm. What is the student's far point?

From the diagram above, if the potential difference across the resistor, capacitor and inductor are 80 v, 110 v, 40 v respectively, the effective potential d...

A binary operation ⊗ ⊗ defined on the set of integers is such that m ⊗ ⊗ n = m + n + mn for all integers m and n. Find the inverse of -5 under this operation...

The diagram above represents the graph of the force F applied in stretching a spiral spring against the corresponding extension (X). The force constant of th...

The wave phenomenon demonstrated in the diagram above is

If a light wave has a wavelength of 500nm in air what is the frequency of the wave? [c = 3 x 108 ms-1]