A wave is displayed on oscilloscope screen. Five complete waves occupy Ten scale division. The calibrated time-base is set on 2ms per division. Determine the frequency of the waves!

A 250 W lamp emits electromagnetic radiation in all directions. Assuming to be a point source, calculate the intensity of the radiation when the cross sectional area 5 m²

A 251.2 W lamp emits electromagnetic radiation in all directions. Assuming to be a point source, calculate the intensity of the radiation at distance 1 meter from the source!

Wave from a source have an amplitude of 6 cm and an intensity of 400 W/m². The amplitude of waves is increase to 18 cm. What is their intensity now?

Wave from a source have an Amplitude of 6 cm and an intensity of 400 W/m². The Intensity of the waves is decreased to 25 W/m². What is their Amplitude?

Sound is a mechanical wave that can be transmitted through a solid. Calculate the frequency of sound with wavelength 7 meters that can travel through water at speed of 1400 m/s

An oscillator shows four complete wave cycles fit on a 20 cm length of the cord when the frequency of the oscillator is 30 Hz. For this wave, calculate the speed of the wave!

A radio has frequency of 400 MHz. Calculate the wavelength of the radio wave?

A radio has wave length of 300 meters. Calculate the frequency of the radio wave?