Why do elements need to be heated to emit color?

When drawing a Bohr diagram for a hydrogen atom, if the element is in the 4th excited state how many energy shells would you draw?

An object with a mass of 1500 g (grams) accelerates 10 m/s2 when an unknown force is applied to it. What is the amount of the force?

Cold butter placed on hot corn melts because of convection. agree disagree it depends

A light ray travelling from diamond into air has an angle of refraction of 56°. A piece of glass is then placed right next to the diamond. (a) How will the angle of refraction change?

Would you expect to find a high or low level of resistance in a copper wire and why?

the half-life of carbon - 14 is 5730 years. What fraction of carbon-14 would remain after 11,460 years?

An object with a mass of 10.9 kg experiences a force of 18.53 N. What is the acceleration of the object? A. 2.2 m/s2 B. 1.7 m/s2 C. 16.83 m/s2 D. 1.3 m/s2

A proton, starting from rest, accelerates through a potential difference of 1.0 kV and then moves into a magnetic field of 0.040 T at a right angle to the field. What is the radius of the proton's resulting orbit

Which of the following terms are needed to completely describe speed? Check all that apply. A. Units B. Direction C. Number D. Mass

Drivers are able to see objects ahead of them because light travels through windshields.