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Who discovered radio waves?

James Clerk Maxwell

Heinrich Hertz (correct)

William Herschel

Hans Christian Oersted

What happens to wavelength as frequency increases?

Wavelength increases

Wavelength is inversely proportional (correct)

Wavelength remains constant

Wavelength decreases

What is the primary application of infrared waves?

Medical imaging (correct)

WiFi communications

Traffic light signaling

Radio broadcasting

Which electromagnetic wave is visible to the naked eye?

Visible light Signup and view all the answers

What is the role of UVA radiation?

Used to treat skin conditions Signup and view all the answers

Which electromagnetic wave has the shortest wavelength?

Gamma rays Signup and view all the answers

What is a significant application of radar technology?

Radio detection and ranging Signup and view all the answers

What causes the deflection of a compass needle according to Oersted's discovery?

Current carrying wire Signup and view all the answers

Which of the following best describes the application of X-rays?

Dental imaging Signup and view all the answers

What significant discovery is associated with gamma rays?

Paul Villard Signup and view all the answers

Which of the following statements about the effects of ultraviolet light is correct?

Overexposure may lead to skin cancer. Signup and view all the answers

What is one of the key effects of infrared radiation?

May lead to eye damage with prolonged exposure. Signup and view all the answers

Which consequence is associated with exposure to X-rays?

It can cause skin burns. Signup and view all the answers

What is the primary function of a concave mirror used by dentists?

To create magnified images of teeth Signup and view all the answers

What is a common application of convex mirrors in retail settings?

To give a wide view of the store and reduce the size of images Signup and view all the answers

How does an electric motor convert electrical energy into mechanical energy?

By causing a coil to rotate in a magnetic field Signup and view all the answers

What property must be increased to enhance electricity generation when moving a magnet through a coil?

The speed of the magnet's movement Signup and view all the answers

What is the main principle behind the operation of a generator?

Transforming mechanical energy into electrical energy Signup and view all the answers

What type of image is formed when an object is placed between the focal point and the pole of a concave mirror?

Virtual and magnified Signup and view all the answers

Which of the following correctly describes a convex mirror?

It has a focal point behind the mirror. Signup and view all the answers

When an object is placed at the center of curvature of a concave mirror, what type of image is formed?

Real and inverted Signup and view all the answers

What happens to the number of images formed as the angle between two mirrors increases from 90° to 120°?

The number of images decreases. Signup and view all the answers

What is defined as the point between the center of curvature and the vertex of a concave mirror?

Focal point Signup and view all the answers

What type of lens is thicker in the center than at the edges?

Convex lens Signup and view all the answers

If a light ray travels parallel to the axis of a convex lens, what happens after it strikes the lens?

It travels to the axis passing through its focal point. Signup and view all the answers

Which characteristic of virtual images can be correctly identified?

They can be upright or inverted. Signup and view all the answers