Answer:
D. Both occur between objects independently whether they are in contact or not.
Explanation:
- The gravitational force is a force that is exerted between two (or more) objects having mass. This force is always attractive and its magnitude is given by
where G is the gravitational constant, m1 and m2 are the two masses, and r is the distance between the two masses.
- The electrical force is a force that is exerted between two (or more) objects having electrical charge. It can be either attractive or repulsive, depending on the sign of the two charges, and its magnitude is given by
where k is the Coulomb's constant, q1 and q2 are the two charges, and r the distance between the two charges.
Looking at both formulas, we see that the two forces are present even when the two objects are not in contact with each other (in fact, r can assume any value in the formula). They are said to be non-contact forces. Therefore, the correct option is
D. Both occur between objects independently whether they are in contact or not.
Because you are not using gas oil etc, in other words you are saving fossil fuels by walking instead of driving a car
also could I get brainliest plz
In order to cause electrons to be ejected from the surface of this metal you should use light of a shorter wavelength.
The photoelectric effect is the emission of electrons when electromagnetic radiation, such as light, hits a material. Electrons emitted in this manner are called photoelectrons. The phenomenon is studied in condensed matter physics, and solid state and quantum chemistry to draw inferences about the properties of atoms, molecules and solids. The effect has found use in electronic devices specialized for light detection and precisely timed electron emission.
This process is also often referred to as photoemission. In terms of their behaviour and their properties, photoelectrons are no different from other electrons. The prefix, photo-, simply tells us that the electrons have been ejected from a metal surface by incident light.
The photons of a light beam have a characteristic energy, called photon energy, which is proportional to the frequency of the light. In the photoemission process, when an electron within some material absorbs the energy of a photon and acquires more energy than its binding energy, it is likely to be ejected. If the photon energy is too low, the electron is unable to escape the material. Since an increase in the intensity of low-frequency light will only increase the number of low-energy photons, this change in intensity will not create any single photon with enough energy to dislodge an electron. Moreover, the energy of the emitted electrons will not depend on the intensity of the incoming light of a given frequency, but only on the energy of the individual photons.
Learn more about Photoelectric effect here : brainly.com/question/1408276
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Vivid writing includes tangible descriptions of
things that can be seen, touched, heard, smelled, and tasted.
Answer:
magnitude of the gravitational force is 9.04 × N
Explanation:
given data
altitude = A = 612 km = 612000 m
mass M = 11,100 kg
mass of the Earth m = 5.97 × kg
Earth average radius = 6.38 × m
to find out
magnitude of the gravitational force
solution
first we get here distance from space to centre of earth that is
distance = altitude + earth radius
distance = 612000 + 6.38 × m
distance = 6.99 × m
so now we get here magnitude of the gravitational force that is express as
magnitude of the gravitational force F = ...........1
here G is gravitational constant that is 6.67 × Nm² /kg and M is mass of space and m is mass of earth
put here all value we get
F =
F =
F = 9.04 × N
so magnitude of the gravitational force is 9.04 × N