1. Indicate whether or not the following observations are due to reflection or r
ID: 1458997 • Letter: 1
Question
1. Indicate whether or not the following observations are due to reflection or refraction.
The red color of an apple. -
An image in a mirror. -
A rainbow -
Why glasses or contacts improve vision. -
In a makeup mirror your face looks enlarged. -
An object underwater looks closer than it is. -
2. A 8.40 cm diameter wire coil is initially oriented so that its plane is perpendicular to a magnetic field of 0.720 T pointing up. During the course of 0.130 s, the field is changed to one of 0.220 T pointing down. What is the average induced emf in the coil?
Explanation / Answer
1.
The red color of an apple. - light reflects so reflection
An image in a mirror. - reflection
A rainbow - refraction of light through water drops
Why glasses or contacts improve vision. - light passes through glasses so refraction.
In a makeup mirror your face looks enlarged. - mirror relflects light so reflection.
An object underwater looks closer than it is - due to refraction of light in water - refraction
2.
Induced emf e = rate of change of magnetic flux
= d( BA) / dt
A = pi r^2 = pi ( 0.084/2)^2 = 5.54 x 10^-3 m^2
e = (5.54 x 10^-3 x ( 0.720 + 0.220)) / 0.130 = 0.04 Volt
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