D is a scintillation counter.
Wavelength and Frequency are inversely related to each other as,
υ = c / λ ----- (1)
Where;
υ = Frequency = 2.40 × 10¹³ s⁻¹
c = 2.99 × 10⁸ ms⁻¹
λ = ?
Solving equation 1 for λ,
λ = c / υ
Putting Values,
λ = 2.99 × 10⁸ ms⁻¹ ÷ 2.40 × 10¹³ s⁻¹
λ = 0.00001245833 m
Or,
λ = 1.24 × 10⁻⁵ m
<span>Contrails are clouds formed when water vapor condenses and freezes around small particles (aerosols) that exist in aircraft exhaust. Some of that water vapor comes from the air around the plane; and, some is added by the exhaust of the aircraft.</span>Aug 5, 2016
Type me the questions i can't see them