4. If the planet Mars is about 56 million kilometers from Earth, how long would

Question

4.         If the planet Mars is about 56 million kilometers from Earth, how long would it take for a radio wave sent from a space satellite circling Mars to reach Earth? Assume that radio waves (a form of electromagnetic radiation) travel at the speed of light.

5.         If a laser with a wavelength of 450 nm emits total 7.25 x 1017 photons over a given time period, what is the total energy produced?

6.         A fluorescent mineral absorbs “black light” from a mercury lamp. It then emits visible light with a wavelength 520 nm. The energy not converted to light is converted into heat. If the mineral has absorbed energy with a wavelength of 320 nm, how much energy (in kJ/mole) was converted to heat?

Explanation / Answer

4.         If the planet Mars is about 56 million kilometers from Earth, how long would it take for a radio wave sent from a space satellite circling Mars to reach Earth? Assume that radio waves (a form of electromagnetic radiation) travel at the speed of light.

V = D/t

t = D/V

d = 56*10^6 km --> 56*10^9 m

c = 3*10^8 m/s

the

t = (56*10^9) /( 3*10^8) = 186.666 seconds

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