Vibrations and waves questions | form five Physics

A steel wire hangs vertiaclly from a fixed point , supporting a weight of 80N at its lower end. The length of the wire from the fixed point to the weight is 1.5m. Calculate the fundamental frequency emitted by the wire when the wire is plucked if the diameter is 0.5mm.

Answer / Solution

UNSOLVED

Give any two applications of ultasonic as applied to sound waves.

Answer / Solution

UNSOLVED

Ultrasound of frequency 4.0MHz is incident at an angle of 30^o to a blood vessel of diameter 1.6mm. If a Doppler shift of 3.2kHz is observed. Calculate the blood flow velocity and the volume rate of blood flow. Assume that the speed of ultrasound is 1.5kms^-1.

Answer / Solution

UNSOLVED

The absorption spectrum of a faint galaxy is measured and the wavelength of one of the lines identified as the calcium H line is found to be 478nm. The same line has a wavelength of 397nm when measured in a laboratory.

1. Is the galaxy moving towards or away from the observer on the earth?
2. Determine the speed of the galaxy relative to observer on hte Earth.

Answer / Solution

UNSOLVED

State the principle of

1. Superposition of waves.
2. Huygens construction of wave fronts

Answer / Solution

UNSOLVED