vegetars8t
2021-12-09
A light wave has a 670 nm wavelength in air. Its wavelength in a transparent solid is 420 nm.
a. What is the light speed in this substance?
b. What is the light’s frequency in the solid?
maul124uk
Beginner2021-12-10Added 35 answers
amarantha41
Beginner2021-12-11Added 38 answers
Step 1
Only the wavelength and speed of a beam of light change as it travels through different media, not its frequency. The experimental speed of light in air is:
Therefore, the frequency of this beam of light is:
;
where v is speed, f is frequency, and is the wavelength. The frequency thus is:
The frequency will remain the same in the solid medium
The speed will then become: meters per second
The distance between the centers of two circles C1 and C2 is equal to 10 cm. The circles have equal radii of 10 cm.
A part of circumference of a circle is called
A. Radius
B. Segment
C. Arc
D. Sector
The perimeter of a basketball court is 108 meters and the length is 6 meters longer than twice the width. What are the length and width?
What are the coordinates of the center and the length of the radius of the circle represented by the equation ?
Which of the following pairs of angles are supplementary?
128,62
113,47
154,36
108,72
What is the surface area to volume ratio of a sphere?
An angle which measures 89 degrees is a/an _____.
right angle
acute angle
obtuse angle
straight angle
Herman drew a 4 sided figure which had only one pair of parallel sides. What could this figure be?
Trapezium
Parallelogram
Square
Rectangle
Which quadrilateral has: All sides equal, and opposite angles equal?
Trapezium
Rhombus
Kite
Rectangle
Karen says every equilateral triangle is acute. Is this true?
Find the number of lines of symmetry of a circle.
A. 0
B. 4
C. 2
D. Infinite
The endpoints of a diameter of a circle are located at (5,9) and (11, 17). What is the equation of the circle?
What is the number of lines of symmetry in a scalene triangle?
A. 0
B. 1
C. 2
D. 3
How many diagonals does a rectangle has?
A quadrilateral whose diagonals are unequal, perpendicular and bisect each other is called a.
A. rhombus
B. trapezium
C. parallelogram