Give Me a High Emits to Shine
A transmitter emits a base wave that has a wavelength of one meter in first second. a wave sensor is placed ten meter in front of it. If the transmitter shortens the wavelength per second, frequency higher twice per second and the sensor light will light up if the energy it gets has reached 12 keV or more. in seconds how much will the sensor's light turn on?
The answer is 21.
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