Science

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1. science//chemistry

   1. Which is conduction?(1 point) energy transfer from a reaction system to its surroundings energy transfer by currents of moving liquid or gas energy transfer as electromagnetic waves energy transfer by direct contact 2.What is a

2. Earth Studies

   Which type of electromagnetic radiation has more energy than visible light and can pass through the human body? A. X-rays B. radio waves C. ultraviolet light D. microwaves 2. Which information about objects in space can

3. Science

   What is the main difference between mechanical and electromagnetic waves? A. Mechanical weaves involved transfers energy; electromagnetic waves do not B. Mechanical waves require a medium to travel in; electromagnetic waves do

4. science

   1- Which of the following statements is true about two objects in thermal equilibrium? a. The thermal energies for the two objects are equal. b. The net flow of heat energy between the two objects is zero. c. The two objects are

1. science

   You know that a collision must be "elastic" if: The momentum of the two-object system doesn't change The sum of the final kinetic energies equals the sum of the initial kinetic energies There is no change in the internal energies

2. Science

   1. A(n)_____ is a material that permits the transfer of heat. A(n)____is a meterial that does not permit the flow of heat.* 1 point A: Insulator, Conductor B: Conductor, Electric Field C: Insulator, Electric Field D: Conductor,

3. physics

   the relationship bwtween frequency, wavelength, and speed holds for light waves because all forms of electromagnetic radiation travel at a single speed in a vaccum. is this true?? or do different forms of electromagnetic radiation

4. Chemistry

   The energy (in joules) of an electron energy level in the Bohr atom is given by the expression: En = -2.179 x 10-18/n2 J where n is the principal quantum number for the energy level. What is the frequency in Hz of the

1. Chemistry

   24. A quantum is a finite amount of energy gained or lost by an atom.- F? 25. An atom is in an excited state when it has its lowest energy.- F 26. The Bohr model of the atom shows electrons in areas called energy levels.- F? 27.

2. Physics

   When a positive charge moves in the direction of the electric field, what happens to the electrical potential energy associated with the charge? It increases. It decreases. It remains the same. It sharply increases, and then

3. physics

   Which of the following statements about electromagnetic radiation is true? -It transfers energy to objects in the path of the electromagnetic waves. -It can be converted to other energy forms. -It transports the energy of

4. Physics

   The work function energy of potassium is 2.2 eV. The surface of potassium is illuminated with electromagnetic radiation of a specific wavelength. Experiments show that the photoelectrons from potassium have kinetic energy in the

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