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Multiple choice physics universe and space science xx radio telescope and space telescopes launching vehicles optical instruments : telescope

Fill in the blank.
Hubble transmits about _____ of raw science data every week.

  1. 100 gigabits

  2. 140 gigabits

  3. 180 gigabits

  4. 200 gigabits
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Hubble data was initially stored on the spacecraft in reel-to-reel tape recorders but these were replaced by solid state data storage facilities during serving missions 2 and 3A. Hubble transmits about 140 gigabits of raw science data every week.

Multiple choice physics universe and space science xx radio telescope and space telescopes launching vehicles optical instruments : telescope

The Corrective Optics Space Telescope Axial Replacement (COSTAR) system was designed to correct the _______________________ for light focused at the FOC, FOS, and GHRS.

  1. visual aberration

  2. spherical aberration

  3. diffraction

  4. none of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The Corrective Optics Space Telescope Axial Replacement(COSTAR) system was designed to correct the spherical aberration for light focused at the FOC, FOS and GHRS. Spherical aberration is the condition when there is a loss in the definition of the image arising from the surface geometry of a spherical mirror or lens. Hence to solve this  condition COSTAR was designed.

Multiple choice physics universe and space science xx radio telescope and space telescopes launching vehicles optical instruments : telescope

Astronomical data taken with ________________ must undergo several calibration steps before they are suitable for astronomical analysis

  1. HOST

  2. CCD

  3. CCR

  4. none of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Astronomical data taken with CCD (charged couple devices) must undergo several calibration steps before they are suitable for astronomical analysis.

Multiple choice physics universe and space science xx radio telescope and space telescopes launching vehicles optical instruments : telescope

All images from Hubble are ___________________,in which its cameras incorporate a variety of filters each sensitive to specific wavelengths of light.

  1. advanced diffracted

  2. monochromatic grayscale

  3. Lucky Cam

  4. none of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

All images from Hubble are monochromatic gray scale, in which its cameras incorporate a variety of filters each sensitive to specific wavelengths of light.

Multiple choice physics universe and space science xx radio telescope and space telescopes launching vehicles optical instruments : telescope

The GHRS was a spectrograph designed to operate in the ___________.

  1. infrared

  2. ultraviolet

  3. visible

  4. none of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The GHRS was a spectrograph designed to operate in ultraviolet light. It was installed on the Hubble Space Telescope during its original constructing and it was launched into space as a part of the space telescope abroad the space shuttle on April 24,1990.

Multiple choice physics universe and space science xx radio telescope and space telescopes launching vehicles optical instruments : telescope

To fit the COSTAR system onto the telescope, one of the other instruments had to be removed, and astronomers selected the________________________to be sacrificed.

  1. CCD

  2. HOST

  3. High Speed Photometer

  4. none of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

To fit the COSTAR system onto the telescope one of the other instruments had to be removed, and astronomer selected the High Speed Photometer (HSP) to be sacrificed.

Multiple choice physics universe and space science xx radio telescope and space telescopes launching vehicles optical instruments : telescope

Hubble's four main instruments observe in the near

  1. ultraviolet range

  2. infrared range.

  3. red wavelength range

  4. yellow wavelength range
Reveal answer Fill a bubble to check yourself
A,B Correct answer
Explanation

The instruments of hubble that analyses light from the universe such as cameras, spectrographs and inter ferometers helps in observing the near UV (ultraviolet range) to IR (infrared range).

Multiple choice physics alternating current power in ac circuits average power in ac circuit and power factor power in ac circuit

For an LCR circuit, the power transferred from the driving source to the driven oscillator is $P = I^2Z cos\phi$ Then

  1. the power factor $cos \phi > 0, P > 0$.

  2. the driving force can give no energy to the oscillator (P = 0) in some cases.

  3. the driving force cannot syphon Out (P < 0) the energy out of oscillator.

  4. all of these.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Power Factor:

(1) It may be defined as cosine of the angle of lag or lead $(i.e, \cos \phi)$
(2) It is also defined as the ratio of resistance and impedance $\left(i.e, \dfrac{R}{Z}\right)$

(3) The ratio $= \dfrac{\text{True power}}{\text{Apparnet power}} = \dfrac{W}{VA} = \dfrac{kW}{kVA} = \cos \phi$

In the given problem power transferred,
$P = I^2Z \cos \phi$
where $I$ is the current, $Z=$ Impedance and $\cos \phi$ is power factor

(a) As power factor, $\cos \phi = \dfrac{R}{Z}$
where $R > 0$ and $Z > 0$
$\Rightarrow \cos \phi > 0 \Rightarrow P > 0$

(b) When $\phi = \dfrac{\pi}{2}$  (in case of $L$ of $C$), $P = 0$.

(c) From (a), it is clear that $P < 0$ is not possible