Someone can help me pls Is physical science class

The objective lens in a microscope with a 17.0 cm long tube has a magnification of -50.0 and the eyepiece has a magnification of

Bas_tet [7]

Answer:

(a) 0.34 cm

(b) 1.32 cm

Explanation:

Given that, $m_{o}=-50$

$m_{e}=20 cm$

And the length of objective lens in a microscope

$L=17$

And we have d of the eyepiece is 25 cm.

(a) Focal length of the objective is,

$f_{o}=-\frac{L}{m_{o} }\\ f_{o}=-\frac{17}{-50} \\f_{o}=0.34 cm$

Therefore, objective lens's focal length is 0.34 cm.

(b) Focal length of an eyepiece,

$m_{e}=(1+\frac{d}{f_{e} })\\ 20=(1+\frac{25}{f_{e} }\\ f_{e}=\frac{25}{19}cm\\ f_{e}=1.32cm$

Therefore, eyepiece's focal length is 1.32 cm.

5 0

3 years ago

What is a black hole's escape velocity?

Igoryamba

<h2>ANSWER</h2>

The simplest definition of a black hole is an object that is so dense that not even light can escape its surface. If we squished the Earth's mass into a sphere with a radius of 9 mm, the escape velocity would be the speed of light. Just a wee-bit smaller, and the escape velocity is greater than the speed of light.

HopeItHelps!

8 0

3 years ago

Which of these is largest? A. asteroids B. comets C. meteoroids D. planets

lys-0071 [83]

Planets are the largest among the list. Take Jupiter or Saturn for example.

5 0

3 years ago

Read 2 more answers

An ambulance traveled on roads from the hospital 14 kilometers east, then 16 kilometers north to reach an accident. If the ambul

Aleksandr-060686 [28]

C . Because I took the test

6 0

2 years ago

How can a heat pump warm a house by causing a refrigerant to evaporate and condense

sveta [45]

The hot discharge gas from the refrigerant compressor is normally cooled and condensed at high pressure. This is then passed through an 'Expansion' valve which decreases the pressure to a low level causing expansion of the refrigerant liquid.
The liquid partially vapourises causing a 'Joule's/Thompson' refrigeration effect' which decreases temperature of the refrigerant which then passes to an evaporator coil in the air circulation system of the building. 
In the evaporator coil, the heat exchange between the cold refrigerant and the warm air of the building, vaporises and heats the refrigerant which returns to the compressor. 
The cycle is repeated until the air temperature reaches the thermostat set-point and switches off the system. 

As a Heat pump, the hot refrigerant gas is not evaporating and condensing. 
From the compressor discharge, the hot gas is by-passing the cooler/condenser unit and the expansion valve and passes directly to the 'evaporator' coils but now, as the heating medium for the air circulation system where it's cooled by the heat exchange between the hot gas and the cooler air in the building and returns to the compressor in a continuous cycle. 

A Thermostat in the system starts and stops the compressor motor according to the heat or cool temperature settings.

4 0

2 years ago