Q:- EXPLAIN WHY THE PLANETS DO NOT TWINKLE. ​

What is the energy of a photon of ultraviolet radiation with a frequency of 4.4 × 1015 hz? planck’s constant is 6.63 × 10–34

You've already seen the value of 9.8 in this lesson. what's this value called? what quantity does it represent?

When the displacement of a mass on a spring is 12a the half of the amplitude, what fraction of the mechanical energy is kinetic energy? at what displacement, as a fraction of a, is the mechanical energy half kinetic and half potential?