An underwater sound wave is incident on a small circular hydrophone port of a marine research probe.
The displacement amplitude of the sound wave is 15 pm15\text{ pm}15 pm. The intensity of the sound at the port is 8.5×10−8 W m−28.5 \times 10^{-8}\text{ W m}^{-2}8.5×10−8 W m−2.
Determine the power of the sound wave incident at the hydrophone port by estimating the diameter of the circular port in mm\text{mm}mm.
diameter of port≈………………………… mm \text{diameter of port} \approx \dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\text{ mm} diameter of port≈………………………… mm power=………………………… W \text{power} = \dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\text{ W} power=………………………… WA different underwater sound wave is now incident on the port. The intensity of this wave is 7.65×10−7 W m−27.65 \times 10^{-7}\text{ W m}^{-2}7.65×10−7 W m−2.
Calculate the amplitude AAA in pm\text{pm}pm of this sound wave.
A=………………………… pm A = \dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\text{ pm} A=………………………… pmState the principle of superposition.
The diagram below shows monochromatic light of frequency 4.80×1014 Hz4.80 \times 10^{14}\text{ Hz}4.80×1014 Hz from a laser incident normally on a double-slit.
A small light sensor is mounted on a motorized stage. The sensor travels along the track at a constant speed of 5.0 mm s−15.0\text{ mm s}^{-1}5.0 mm s−1.
The separation between the slits is 0.20 mm0.20\text{ mm}0.20 mm. The perpendicular distance between the slits and the track is 4.0 m4.0\text{ m}4.0 m.
A series of bright and dark fringes are detected by the moving light sensor.
Explain, in terms of phase difference, the origin of the fringes.
Calculate the time interval ttt between successive bright fringes to the detector. Write your answer to 2 significant figures.
t=………………………… s t = \dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\text{ s} t=………………………… s
