Earthquakes can produce three types of waves. One of these is a transverse wave called an S wave. A typical S wave travels at 5000 m/s. If its wavelength is 417m, calculate the frequency of the S wave.
Properties of sound
A sound wave is a mechanical wave (or mechanical vibration) that transit through media such as gas (air), liquid (water), and solid (wood).
Quality Of Sound
A sound or a sound wave is defined as the energy produced due to the vibrations of particles in a medium. When any medium produces a disturbance or vibrations, it causes a movement in the air particles which produces sound waves. Molecules in the air vibrate about a certain average position and create compressions and rarefactions. This is called pitch which is defined as the frequency of sound. The frequency is defined as the number of oscillations in pressure per second.
Categories of Sound Wave
People perceive sound in different ways, like a medico student takes sound as vibration produced by objects reaching the human eardrum. A physicist perceives sound as vibration produced by an object, which produces disturbances in nearby air molecules that travel further. Both of them describe it as vibration generated by an object, the difference is one talks about how it is received and other deals with how it travels and propagates across various mediums.
Q 1.
a. Earthquakes can produce three types of waves. One of these is a transverse wave
called an S wave. A typical S wave travels at 5000 m/s. If its wavelength is 417m,
calculate the frequency of the S wave.
b.An electric razor completes 60 cycles every second. What is its frequency? What is
its period?
c.What is the approximate distance of a thunderstorm when you note a 3 second delay
between the flash of lightning and the sound of the thunder?
d. A laser beam is reflected by a plane mirror. It is observed that the angle between the
incident and reflected beams is 28º. If the mirror is now rotated so that the angle of
incidence increases by 5.0 º, what is the new angle between the incident and
reflected beams?
e. Light travels a distance of 0.960m in 4.00 ns in a given substance. What is the index
of refraction of the substance?
f.Explain why the
material. State which properties change and which stay the same.
Q 2. a. Light enters a container of benzene at an angle of 43 º to the normal. The refracted
beam makes an angle of 27 º with the normal. Calculate the index of refraction of
benzene
b. An object is placed 25.0 cm away from a concave mirror that has a focal length of
5.00 cm. Where is the image located?
c. An object 3.0 cm tall is placed 20 cm in front of a converging lens. A real image is
formed 10 cm from the lens. What is the focal length of the lens?
d. Bob is stranded on a tropical island. To feed himself, he has carved a fishing spear
out of a lovely piece of drift wood. Bob stands in the water waiting for a suitable fish
to swim by. Finally, he is in luck. Using knowledge of light and a nice diagram,
explain where Bob should aim his spear to make sure he skewers himself some
supper
e. In April of 2019, scientists managed to capture an actual image of a black hole.
Explain why scientists have not been able to capture an image before now, and
describe what was involved in the process that allowed them to achieve an actual
image.
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