Real world efficiency are generally very high in the 90 percent range, true or false?

Which of the following devices is used in this experiment to separate the different wavelengths emitted by the light source? A. Prism B. A transmission grating C. A reflection grating D. All of the above

If the frequency of the waves produced by a vibrating object increases, how does the wavelength of the waves produced change? A) It stays the same B) It decreases C) It vibrates D) It increases

A ball is thrown with an initial speed of 10. Meters per second. At what angle above the horizontal should the ball be thrown to reach the greatest height?

Which system protects us from radiation and the vacuum of space? a. geosphere b. hydrosphere c. atmosphere d. biosphere

I just want this information cuz it will come in handy in science soon. Where and how are Gamma rays found?

Why will marchers at the end of a long parade following a band be out of step with marchers nearer the band

How would you explain photosynthesis to a new student in class

If the abosolute of a gas is 600 k, the temperature in degrees Celsius is

How does an electromagnetic wave propagate itself? a. A changing magnetic field induces an electric field perpendicular to the magnetic field. b. A changing electric field induces a magnetic field perpendicular to the electric field. c.

Which of the following is an example of convection? A. hot air rising and cooler air falling B. a hot object transferring heat to a cooler one C. a hot oven warming the air around it D. the rays of the Sun warming the earth