What is the gravitational potential due to a molecule of mass (m) and at a distance (r) from it? (G = gravitational constant).
A. Gm²/r² B. Gm/r C. Gm²/r D. G²m2/r E. m²/Gr² Correct Answer: Option B – Gm/rWhich of the following is not a property of longitudinal waves?
A. compression B. reflection C. refraction D. polarization E. diffraction Correct Answer: Option D – polarization
A string is stretched between two points 50cm apart. It is then plucked at its center and the velocity of the wave produced is 300m/s. Calculate the number of vibrations made by the string in 1s.
A. 3 B. 6 C. 150 D. 300 E. 600 Correct Answer: Option D = 300 Explanation λ = 2 x 50 = 100cm = 1m. V = fλ, f = v/λ = 300.
In a wave the maximum displacement of particles from their equilibrium positions is called?
A. frequency B. amplitude C. period D. wavelength E. wave velocity Correct Answer: Option B – amplitude
Assuming speed of the pulse is 2000ms−¹; calculate the distance between the layers.
A sound pulse sent vertically downwards into the earth is reflected from two different layers of the earth such that echoes are heard 1.2s and 1.4s. Assuming speed of the pulse is 2000ms−¹; calculate the distance between the layers. A. 200 m B. 400 m C. 2400 m D. 2600...Products
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