with the same generator, so the only factor for producing the slectric field is only the speed. The faster the rotational speed of the generator the greater it produce electric field. So the sequence is 3000 rpm < 3200 rpm < 3400 rpm < 3600 rpm
Answer: 3000
3200
3400
3600
Explanation: just took the test 5 out of 5
B) change the location of a volcanic eruption
C) predict the damages due to an earthquake
D) stop the occurrence of tsunamis due to an earthquake
Efficiency is the measure of how efficient a process is. It is used to assess the ability of a process in avoiding waste energy, materials, money and time in doing a desirable output. It is calculated as;
Efficiency = useful energy ouput / total energy input
Efficiency = 15(9.81)(20) / 3450 = 0.85
Output= m*g*h = 15*9.8*20 = 2,940J
Input= 3450J (given)
Efficiency = output/input = 2,940/3450 = 0.85% efficient
b. False
Answer: The correct answer is False.
Explanation:
Infrared is an example of electromagnetic wave. The wavelength of this wave is shorter.
Sunburn is caused by UV-radiations because the wavelength of this wave is longer and energy is higher.
Relationship between wavelength and energy is given by the Planck's equation:
where,
E = energy of the wave
h = Planck's constant
c = speed of light
= Wavelength of the wave
From the above relation, wavelength of the wave is inversely proportional to the energy of the wave. Hence, infrared rays does not cause any sunburn because these waves have low energy and does not effect the skin.
Hence, the correct answer is False.
2) 5m
3) 500m
3) 5,000,000m
An electromagnetic am band radio wave could have a wavelength of 500m, i.e., 500 meters(Option 3).
A wavelength is a disturbance that travels into space with a given frequency and amplitude.
In conclusion, an electromagnetic am band radio wave could have a wavelength of 500m (Option 3).
Learn more about electromagnetic wavelengths here:
#SPJ5