If a neutral metal comb is held near an object with a negative charge the comb will become charged by?options

A. induction
B.contact
C.friction
D.static discharge

Answers

Answer 1

Answer: the answer is d because it sets of a negative pulls type thing that makes it negative

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The angle between magnetic north and the north to which a compass needle points is known as magnetic declination.Please select the best answer from the choices providedTF

What do you call the molten material

Answers

Molten material is also know as lava

Which contributes to acid rain? A. solar power

B. burning fossil fuels

C. nuclear power

D. hydroelectric power

Answers

The answer is D. hydroelectric power

What do ultrasounds use?radio waves
ultraviolet waves
light waves
sound waves

Answers

Ultrasounds are used in the medical profession for the purpose of diagnosis. Ultrasounds uses high frequency sound waves. Thus, the correct option is D.

What are Ultrasounds?

Ultrasound are the sound waves with frequencies which are higher than the upper audible limit of normal human hearing. Ultrasound is not different from normal audible sound frequencies in its physical properties, except that humans cannot hear these sound.

Ultrasound is used in diagnostics where it is also called as sonography or diagnostic medical sonography. It is an imaging method which uses sound waves to produce images of structures within the body of a person. The images produced can provide valuable information for the purpose of diagnosing and directing treatment for a variety of diseases and conditions.

Therefore, the correct option is D.

Learn more about Ultrasound here:

brainly.com/question/14902329

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Answer:

D. sound waves

Explanation:

on edg

Which of the following is an example of diffraction? A. Hearing a band play through an open doorway without seeing them. B. Sitting in a room and watching a band play. C. Playing in a band. D. None of these examples show diffraction.

Answers

A because diffraction is the bending of waves around small obstacles or openings. That’s why you can hear a band through an open doorway without seeing them

Explain why ultra-high voltages are
used to carry electricity over transmission lines.

Answers

Well, let's take it the other way. If you have a rather low voltage (220 volts -- Europe -- is low) you'd get a high current, which more easily dissipates as heat, resulting in loss of energy. Using a high voltage you have a low current which could easily be transported with almost no loss.

Why is it useful to create neptunium by bombarding uranium with protons even though neptunium disintegrates in about two days?

Answers

Answer;

Neptunium breaks down to produce plutonium used in bombs and americium.
it is also used in smoke detectors

Explanation;

Neptunium may be made by bombarding uranium with neutrons. However Neptunium atoms disintegrate to form plutonium.

Neptunium is useful. When Neptunium is bombarded with neutrons it is used to produce plutonium-238 which is used for spacecraft generators and terrestrial navigation beacons.
Plutonium used in bombs and americium. it is also used in smoke detectors.
Additionally, Neptunium is used in neutron detection equipment.

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