The waveform of a certain signal can be studied by

Spectrometer
Cathode ray oscilloscope
P – n junction diode
Sonometer
Sonometer  A spectrometer is an instrument used to measure properties of light over a specific portion of the electromagnetic spectrum. Cathode ray oscilloscope is an electronic display device containing cathode-ray tube (CRT) that generates an electron beam that is used to produce visible patterns or graphs on a phosphorescent screen. A sonometer is an apparatus made of hollow box having two holes. A string is attached to it by which the transverse vibrations of strings can be studied.

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A. Rayleigh scattering
B. Mie scattering
C. Back scattering
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A. Concave lens
B. Convex lens
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B. Refracted
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Mach number is used in connection with the speed of
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B. aircraft
C. spacecraft
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