The figure shows the path of a ray of light as it travels through ethyl alcohol and crosses a boundary into an unknown medium. The angles of incidence and refraction are 62° and 55.6°, respectively. What is the speed of this ray of light as it travels through the unknown medium?

Two converging lenses, each with a focal length of 8 cm, are used in combination to form an image of an object that is located 24 cm to the left of the left lens in the pair. The distance between the lenses is 16 cm. Where is the final image located relative to the lens on the right? The diagram is not drawn to scale.  

When certain light rays pass from a vacuum into a block of an unknown material, the measured index of refraction of the material is 3. What is the speed of light inside the block?

What is the mass defect of S50120n{“version”:”1.1″,”math”:”S50120n”}?

What is the approximate radius of a nitrogen nucleus that has seven protons and seven neutrons?

Mrs. McKay has been prescribed eyeglasses with lenses that have a +3.2-diopter refractive power. The glasses are worn 2 cm from her eyes. With the lenses, she can read a magazine held 25 cm from her eyes. How far is her near point from her eyes?

How many neutrons are there in the nucleus C55134s{“version”:”1.1″,”math”:”C55134s”}?

Light with a wavelength of 589 nm and frequency 3.344 x 1014 Hz travels in a certain substance. Through which substance is this light traveling?

A laser is mounted on a table 1.06 m above the ground, pointed at a vertical mirror a horizontal distance 3.5 m away. The laser beam strikes the mirror 1.62 m above the ground. Behind the laser is a wall, 2.8 m from the aperture where the laser beam emerges. At what height above the ground does the reflected beam strike the wall.

A magnetic field is directed perpendicular to the plane of a 0.15 m × 0.3 m rectangular coil consisting of 240 loops of wire. To induce an average emf of –2.5 V in the coil, the magnetic field is increased from 0.1 T to 1.8 T during a time interval Dt. Determine Dt.