Which stations signal has waves with longer wavelengths? 90.5 mhz or 107.1 mhz?

Which transition by an electron will release the greatest amount of energy? oa ob oc od

Considering only the earth's rotation, determine how much later the asteroid would have had to arrive to put the explosion above helsinki at longitude 25˚ e? this would have obliterated the city.

If the textbook weighs 19.6 newtons on venus,what is the strength of gravity on venus?