Which of the following is true about electromagnetic radiation?  a. Wavelength is proportional to frequency.  b. Wavelength has units of s-1 or Hz.  c. None of these statements are true.  d. Wavelength is inversely proportional to energy.  e. Waves of different wavelengths travel at different speeds in a vacuum

1a. The Intensity of the radiation incident at the earth from the sun is 1380Wm^-2. If the distance from the Sun to the earth is 1.5x10^11m calculate the total power radiated by the Sun. b. In a solar panel 500g of water flow through the pipes in 1 minute. If the temperature the temperature is raised by 20°C how much solar power was absorbed by the water? c. There are plans to build a lot of wind turbines in the sea. Give two advantages of building turbines in the sea compared to land. d. The power in a length of water wave is 1MW. Calculate the power in the wave if the amplitude doubles.

Which Form fo radiation from the electromagnetic spectrum is MOST LIKELY to cause mutations in growing tissues, and should be MOST avoided by pregnant women? A. Microwaves  B. X-Rays C. Radio Waves D. Infrared Waves.

How can microwave ovens heat food more quickly than conventional ovens? A. microwaves give energy directly to the molecules in the food B. conventional ovens must conduct heat from the surfaces to the interior of the food. C. microwaves heat the inside as well as the surface of the food D. all of the above answer- Microwaves heat up food by emitting radio waves that directly target the molecules in your food to vibrate them. it is option A