A. Wavelength of noise
B. A musical instrument
C. A measure of sound level
D. All of these

A. Electromagnetism
B. Electroplating
C. Alchemy
D. Goldification

A. Thermometer
B. Hygrometer
C. Piezometer
D. Seismograph

A. inertia
B. Energy Conservation
C. Newton 3rd law
D. None of these

A. Concave
B. Convex
C. Combined Lens
D. None of these

A. Reflection
B. Refraction
C. Diffraction
D. Total Internal Reflection

A. Dalton
B. Newton
C. Micheal
D. None

A. Newton
B. Dalton
C. Einstein
D. None of these

A. Conduction
B. Convection
C. Radiation
D. None of these

A. Volta
B. Excide
C. Fermi
D. Maiman