Question
Noise is measured in
–Solution
The decibel (dB) is a logarithmic unit that indicates the ratio of a physical quantity (usually power or intensity) relative to a specified or implied reference level. A ratio in decibels is ten times the logarithm to base 10 of the ratio of two power quantities. 230. (4) Bats use echolocation to navigate and forage, often in total darkness. They generally emerge from their roosts in caves, attics, or trees at dusk and hunt for insects into the night.
A coin is placed at the bottom of a tank filled with water (n = 4/3) to a depth of 12 cm. How much shall the coin appear raised?
If the phase difference between two points is 120° for a wave with velocity of 360 m/ and frequency 500 Hz, then path difference between the two points...
One can distinguish a telescope from a microscope by observing –
Match the following:
Which of the following is an example of a communicable disease?
What is the full form of DNA?
A mass m is suspended from a spring of spring constant k and oscillates with amplitude A. The maximum velocity during oscillation is:
Which of the following is not a unit of energy?
Calculate the work done when a force of 10 N moves an object 5 m at 60° angle to direction of force.
What type of immunity is provided by vaccination?
