Question
What does the "Projection" operation in relational
algebra do?Solution
Selects certain columns from a relation
A sound wave has a frequency of 500 Hz and wavelength of 0.68 m. What is the speed of sound?
The stopping potential for photoelectrons emitted from a metal surface when light of frequency 8×1014 Hz is incident is 3 V. What is the wo...
What is the speed of sound in air at room temperature (approx)?
An object at rest will remain at rest and an object in motion will remain in motion until and unless it is acted upon by an external force. This is New...
A container is filled with two immiscible liquids of densities ρ₁ = 1000 kg/m³ (height 0.3 m) and ρ₂ = 800 kg/m³ (height 0.2m) stacked above eac...
A particle starts from rest and accelerates uniformly at 2 m/s² for 5 seconds, then moves with constant speed for 5 seconds and finally decelerates uni...
When a cannonball is fired, its motion is an example of ______.
Sensitivity of the human eye is maximum in the –
A ray of light is incident on a transparent medium at an angle of 60°. The reflected ray of light is found to be completely Q.4 polarized. Then, the r...
What is the unit of power in an electrical circuit?
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