Question

Professional research telescopes should be large enough to gather sufficient radiation from space. Which of these statements best explains why a reflecting telescope is is best used as a professional research telescope?

Bigger lenses are easier to manufacture and they produce less distortion.
Mirrors of reflecting telescopes gather harmful radiations from space.
Reflecting telescopes reflect away more radiation and distort images.
The series of mirrors and lenses help to reduce distortion of images.

Answer 1

@FibonacciChick666

Answer 2

Anyone?????

Answer 3

@bani2100

Answer 4

I think the third statement explains more.

Answer 5

reflecting telescopes reduce image distortion over refracting (lens) telescope because light my disperse when there is refraction.

Answer 6

Yeaaaaah, festinger is right, Just don't mind my answer. Trust @Festinger :)

Answer 7

So it's not C?

Answer 8

the thing is reflective telescopes have a curved mirror at it's base, so all rays captured are essentially focused at mirror 2, which will bounce it to the eye or camera. so theoretically it should not lose more than it captures.

large lenses are not easier to manufacture, but they do reduce distortion.
mirrors don't absorb harmful radiation. if anything harmful radiation pass right through them.

Answer 9

So C right @Festinger

Answer 10

Wait D? Right?

Answer 11

My "guess" is D. I can guarantee A is wrong. But sorry I'm not much help other than that.

Answer 12

Thanks to everyone that helped!!!!!! @Festinger @FibonacciChick666 @louiseopura

Answer 13

One more left......

Look at the spectrum of Star 1 which is moving towards Earth and the spectrum of Star 2 which is moving away from Earth. The band in the middle represents the spectrum of a motionless light source.

Which of these is a correct inference that can be draw from the observation of the three spectrums?

The spectrum shifts towards the red region when the star moves towards Earth.
The spectrum shifts towards the blue region when the star moves towards Earth.
The spectrum is identical for moving stars and motionless stars.
The spectrum is identical for stars moving away from Earth and stars moving towards Earth.

Answer 14

@Festinger

Answer 15

For the telescope it's D.

For this it's :The spectrum shifts towards the blue region when the star moves towards Earth.

Answer 16

This effect is known as doppler shift. If something moves towards you it shifts to the blue region and is called blue shift.

If something moves away from you it shifts to the red region and is called red-shift.

Answer 17

Thank you sooooo much!!!!!!!!!!!!!

Answer 18

The light from Star 1 reaches Star 3 in 138 years and Star 2 in 63 years. Which of these conclusions about the stars is correct?

The distance between Star 2 and Star 3 is 75 light years.
The distance between Star 2 and Star 3 is 201 light years.
Star 2 is 138 miles away from Star 3.
Star 2 is 63 kilometers away from Star 3.
@Festinger

Answer 19

Anyone??

Answer 20

it is either :
The distance between Star 2 and Star 3 is 75 light years.
The distance between Star 2 and Star 3 is 201 light years.

cannot deduce without more information.

Answer 21

I put A but no sure