A stone is dropped from a tower 100 meters above the ground. The stone falls past ground level and into a well. It hits the water at the bottom of the well 5.00 seconds after being dropped from the tower. Calculate the depth of the well. Given: g = -9.81 meters/second2.

Using a cathode ray tube, Thomson confirmed that atoms are made of particles that have a negative charge., therefore the correct answer is option B

What are atomic models?

There are some models that are used to explain the arrangements of subatomic particles inside the atom based on the atomic theory of atom are known as the atomic models.

J.J. Thomson discovered using cathode ray tubes that something emits from the negative plate (referred to as the cathode) and travels towards the positive plate (referred to as the anode), and that when zinc sulfide (also known as a phosphor) coating is applied to the perforated anode, it exhibits green fluorescence at a specific pressure and temperature values.

Thus,by using a cathode ray tube, Thomson confirmed that atoms are made of particles that have a negative charge., therefore the correct answer is option B

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Option (B) is correct .i.e. atoms are made of particles that have negative charge.

Further explanation:

Using cathode ray tube, J.J Thomson found that something emits from the negative plate (called as cathode) and goes towards the positive plate (called as anode), and on applying zinc sulfide (also called phosphor) coating on the perforated anode, it shows green fluorescence at some particular values of pressure and temperature.

William Crookes called them the cathode rays as were originated from cathode. Further, Atoms are overall neutral having equal amounts of positive and negative charge as he explained in his plum pudding model.

Although, electrons in atoms have varying energy but this was not confirmed by J.J. Thomson, also electrons can’t be inside nucleus because this would make atoms very unstable.

Some of the properties of those cathode rays are as follows:

(1). They are made up of material particles (they made the light wheels rotate that come in their path).

(2). The green fluorescence was also observed when he putted two more plates perpendicular to the earlier path and the rays followed a curved path towards the new anode.

(3). They has an ionizing property (they ionizes the gas present in the cathode ray tube, through which they pass).

Thus, Option (B) is correct because the cathode rays are emitted from the metallic plate which’s atoms have particles having negative charge.

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Answer Details:

Grade: High School

Subject: Physics

Chapter: Modern physics

Keywords:

Atoms, cathode, cathode rays, cathode ray tubes, J.J. Thomson, negatively charged particles, nucleus, energy, varying energy, electrons, green fluorescence, phosphor, anode, protons, pressure, temperature, William Crookes.

Answer: C, the same

Explanation:

This is a practical use of the concept of conservation of mass. Mass cannot be created or destroyed, so if you start with 1.5 kg, as long as you dont lose any (which it says you don't) you will end with 1.5kg.