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Which way does light change direction when it comes out of a block of glass?

Light changes direction when it exits a block of glass due to refraction, bending away from the normal (perpendicular) to the surface. The change in direction is caused by the change in speed of light as it moves from one medium to another with a different refractive index.


What is the Use of Gravity?

because without gravity there would be no universe as we know it. gravity is what keeps us and everthing else on earth. it is the tendency of objects with mass to be attracted to each other. an objects mass is the amount of material it contains. the bigger the mass of an object, the stronger its force of gravity.


What is hall effect sensor?

A Hall Effect sensor is a transducer that varies its output voltage in response to a magnetic field.In its simplest form, the sensor operates as an analog transducer, directly returning a voltage. Hall Effect Sensors consist basically of a thin piece of rectangular p-type semiconductor material such as gallium arsenide (GaAs). When the device is placed within a magnetic field, the magnetic flux lines exert a force on the semiconductor material which deflects the charge carriers, electrons and holes, to either side of the semiconductor slab. This movement of charge carriers is a result of the magnetic force they experience passing through the semiconductor material. As these electrons and holes move side wards a potential difference is produced between the two sides of the semiconductor material by the build-up of these charge carriers. The effect of generating a measurable voltage by using a magnetic field is called the Hall Effect. Hall Effect sensors and switches are designed to be in the "OFF" when there is no magnetic field present. They only turn "ON", when subjected to a magnetic field of sufficient strength and polarity.There are two basic types of digital Hall Effect sensor, Bipolar and Unipolar. Bipolar sensors require a positive magnetic field (South Pole) to operate them and a negative field (North Pole) to release them while unipolar sensors require only a single magnetic south pole to both operate and release them as they move in and out of the magnetic field. Here we are using a unipolar sensor


What is the meaning of gravity?

Imagine a table cloth held on by each corner above the ground. This is the universe. Put an apple on it. This is a planet. The apple makes a dent. This is gravity. Put grapes on the cloth. These are smaller planets. They are drawn to the apple. Put a soccer ball on the cloth. This is a very large planet. Everything moves towards it. Gravity.


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