An EM wave with a frequency of 10 7 Hz would be classified as infrared because of the frequency of 10 7 Hz
It's false because in some countries it's used to make power.
Answer:
A. An electric motor hums as it powers a conveyor belt
D. A car engine heats up while the car is being driven.
Explanation:
Energy inefficiency usually involves loss of energy as other forms when they are being converted from one form to another.
The two choices that fit the description includes;
- An electric motor humming as it powers a conveyor belt. This energy conversion is supposed to be from electrical to mechanical energy but there is a loss due to the sound energy produced by the motor.
- Heat energy produced as the car is driven also results in energy inefficiency.
Other choices do not show this inefficiency.
Answer:
The average global temperatures has increased since 1880 due to the emission of toxic gases in the atmosphere.
Explanation:
- In average the global temperature of the earth has increased by 1 degree Celsius (2 degrees Fahrenheit). It includes the combined land and ocean's temperature.
- The main reason for this increase in global temperature is the emission of gases like carbon dioxide, CFC's and other greenhouse gases.
- Human activities, industrialization, modernization etc. are majorly responsible for this increment in temperature through the centuries.