Bohr believed that light is emitted by an electron when

a. the electron completes a revolution in its orbit.

b. the electron's energy changes.

c. the electron's fixed orbit shifts.

d. the electron changes direction in its orbit.

100 J of work in 10 seconds

Which of the following is used to determine if a star is moving closer to Earth?

One of two nonconducting spherical shells of radius a carries a charge Q uniformly distributed over its surface, the other carries a charge - Q, also uniformly distributed. The spheres are brought together until they touch. A.

Where is planet mercury located in the solar system?

Two new planets with equal masses are discovered. Planet "A" is twice as far from the sun as planet "B." Which of the following is true. a.

How work done against gravity can be expressed?

An electron is acted on by two electric forces, one of 2.7*10-14 N acting upward and a second of 5.8*10-14 N acting to the right. What is the magnitude of the electric field at the electron's location?

A satellite on a Low Earth Orbit is flying with a speed of 7.65 km/s. The vertical component of the Earth's magnetic field is 35.3 μT at the current location of the satellite.

A central air conditioner uses 4.5 kilowatts. It runs for 10 hours over the course of a day. How much energy does the air conditioner use during that day?

Hich of the following needs is an addition to Maslow's original hierarchy and only appears in the eight-stage revised model