Answer:
Explanation:
Given:
- original frequency of the wave,
- velocity of the blood stream moving away,
Doppler shift is given as:
where:
s = velocity of ultrasound in blood = 
velocity of sound source towards the observer
velocity of the observer away from the source
Therefore the shift in frequency:
Answer:
Frequency and wavelength are inversely proportional to each other. The wave with the greatest frequency has the shortest wavelength. Twice the frequency means one-half the wavelength. For this reason, the wavelength ratio is the inverse of the frequency ratio.
Answer:
19 cm
Explanation:
inner radius, a = 16 cm, C = 113 p F = 113 x 10^-12 F
Let b cm be the radius of outer sphere.
The formula of capacitance of spherical capacitor is given by
C = 4π∈0 a b / (b - a)
a b / ( b - a) = C / 4π∈0
a b / ( b - a ) = 113 x 10^-12 x 9 x 10^9
a b / ( b - a ) = 1.017
16 x 10^-2 x b x 10^-2 = 1.017( b - 16) x 10^-2
0.16 b = 1.017 b - 16.272
0.857 b = 16.272
b = 19 cm
Answer:
The Fluorescent lamp is most efficient
Explanation:
66.7 lumens/watt
Fluorescent was always the most efficient vs. incandescent or halogen gas envelope
This question needs some updating as LED lamps now beat fluorescents in life expectancy and lumens/watt.
