A) Radio waves are a form of electromagnetic radiation.
TRUE
It is the type of electromagnetic wave with least energy range and longest wavelength range among all
B) Electromagnetic radiation does not require a medium to travel.
TRUE
This radiation can travel through vacuum also and its speed is maximum in vacuum
C) In a vacuum, electromagnetic radiation travels at the speed of light.
TRUE
speed of all electromagnetic radiation is same as speed of light in vacuum
D) Electromagnetic radiation travels in the form of longitudinal waves.
FALSE
All electromagnetic radiation is always in form of transverse waves
So correct options are
<u>A, B, C</u>
Given:
distance from the projector lens to the image, di
projector lens focal length, f
distance from the transparency to the projector lens, do
thin lens equation: 1/f = 1/di + 1/do
do = 4 inches
di = 8 feet
convert feet to inches, for uniformity.
1 foot = 12 inches
8 feet * 12 inches/ft = 96 inches
1/f = 1/96 inches + 1/4 inches
Adding fractions, denominator must be the same.
1/f = (1/96 * 1/1) + (1/4 * 24/24)
1/f = 1/96 + 24/96
1/f = 25/96
to find the value of f, do cross multiplication
1*96 = f * 25
96 = 25f
96/25 = f
3.84 = f
The focal length of the project lens is 3.84 inches
Answer:
F=ma
here F is force, m is mass and a is accelaration,
According to the question,
F=3*F= 3F
m= 1/3 of m= m/3
a= ?
so the equation becomes,
3F= m/3*a
3F*3= ma
9F=ma
F= ma/9
Therefore accelaration reduces by 1/9.
I am not very sure.
The yellow star will live longer as it has less mass
