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?

Answer 1

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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