The image that is obtained from an concave mirror is increased two times. If we bring the object closer to the mirror for 2cm in relation to the it's previous position, then the image will also increase 6 times. Calculate the focal length of the mirror.

What color of light must blue light mix with to create white light? a. yellow b. white c. blue d. green

The atoms in a nickel crystal vibrate as harmonic oscillators with an angular frequency of 2.3 × 1013 rad/s. the mass of a nickel atom is 9.75 × 10-26 kg. what is the difference in energy between adjacent vibrational energy levels of nickel? (h = 6.626 × 10-34 j • s, , 1 ev = 1.60 × 10-19 j)

70 give a real life example showing how sensory neurons work with the motor neurons