Which of the following is not an electromagnetic radiatio...
Which of the following is not an electromagnetic radiation?
X-ray
Radio waves
Sunlight
Sound waves
Infra-red radiation
Correct answer is D
No explanation has been provided for this answer.
A note of frequency 2000Hz has a velocity of 400 ms-1. calculate the wavelength of the note...
Which of the following statements about the universal gravitational constant, G, is true? ...
The phase difference between waves P and q in the diagram above is ...
The optical instrument which is suitable for viewing a nearby objects is ………..?...
The surface temperature of a swimming pool on a warm day is 25ºC and the temperature at the bot...