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dem82 [27]
3 years ago
6

A diverging lens has a focal length of 18.0 cm. An insect is placed 7.00 cm in front of the lens. What is the magnification

Physics
1 answer:
musickatia [10]3 years ago
3 0

Diverging lens=concave lens

The image would be after the first focal point but before the lens and it will be smaller than the object. Look at my picture for reference. Please let me know if this helped you!

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Calculate the wavelength in centimeters of radar energy at a frequency of 10 GHz. What is the frequency in gigahertz of radar en
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Answer:

Energy will be equal to 6.6\times 10^{-27}J

Frequency will be equal to 12\times 10^8Hz

Explanation:

We have given frequency of the radar f = 10 GHz =10\times 10^6Hz

Speed of light c=3\times 10^8m/sec

Plank's constant h=6.6\times 10^{-34}js

So energy E=h\nu,here h is plank's constant and \nu is frequency

So energy E=6.6\times 10^{-34}\times 10^{7}=6.6\times 10^{-27}J

In second case we have given wavelength = 25 cm = 0.25 m

Wavelength is equal to \lambda =\frac{c}{f}

So f=\frac{c}{\lambda }=\frac{3\times 10^8}{0.25}=12\times 10^8Hz

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8 0
3 years ago
An object is thrown straight down with an initial speed of 4 m/s from a window which is 8 m above the ground. Calculate: a) The
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Answer:

0.41s

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Explanation:

Using the formula; v = u + at

Where;

u = initial velocity (m/s)

v = final velocity (m/s)

t = time (s)

a = acceleration (m/s²)

According to the provided information, u = 4m/s, s = 8m,

V = u + at

4 = 0 + 9.8t

4 = 9.8t

t = 0.41s

b) v = u + at

v = 4 + 9.8(0.41)

v = 4 + 4.018

v = 8.018m/s

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