Question

Notify Me Bookmark

A radio signal is detected from a previously unknown star. The star is found to be 6.0×1016 m away. How long did it take the light to reach Earth? 2.0×108 years 6.3 years 3.1 years 5.0×107 years

A radio signal is detected from a previously unknown star. The star is found to be 6.0×1016 m away. How long did it take the light to reach Earth? 2.0×108 years 6.3 years 3.1 years 5.0×107 years

Image text
A radio signal is detected from a previously unknown star. The star is found to be 6.0 × 10 16 m away. How long did it take the light to reach Earth? 2.0 × 10 8 years 6.3 years 3.1 years 5.0 × 10 7 years

Detailed Answer

0 0

Please enter your email here. You will get email when this question is answered by our tutor.

Doubtrix Logo

Problem is not yet solved!

Click on Notify me to get email when question is answered.

Join Doubtrix with 7-days free trial

  • Icon Correct & Verified Answers
  • Icon No AI-Generated Answers
  • Icon Video Solution for Difficult Questions
  • Icon Work With Experts to Reach at Correct Answers
Notify me Login Sign Up

Similar/Related Questions

A thermometer is removed from a room where the temperature is 21 deg C and is taken outside. Where the air temperature is -10 deg C. After one-half minute the temperature reads 12 deg C. What is the reading of the thermometer at t = 1 min? (round your answer to two decimal places) How long will it take for the thermometer to reach -8 deg C? round your answer to two decimal places)
Solution
1 0

Consider a DRAM cell that uses an internal capacitor of 20 fF; it is charged to 3.3 V when storing a ' 1 '. In this problem, ignore body effect. (A real transistor like the access transistor here, or pass transistors in switch logic, can turn off before you want it to because of body effect; this one stays on until the 20 fF capacitor is fully charged. ) (6-points) (a) When writing a ' 1 ', how long does it take for the voltage on the capacitor to rise to 95% of its final value? Assume that when it is on, the access transistor in the cell has an average resistance of 6 kΩ; assume that the inverter driving the bit line has an average pull-up resistance of 1 kΩ. Ignore the resistance and capacitance of the bit line itself. (In a real memory, wire parasitics play a big role!)? (b) Suppose that when reading, the bit line is first charged to 3.3 V. The bit line is a large piece of metal, and has a total capacitance of 500 fF. How far does the bit line drop in voltage if a ' 0 ' is read? (Hint: In circuits, you learned that charge on capacitors in parallel redistributes until the voltage is equal; assume enough time is given for the bit line to drop as far as it ever will. )? (c) Suppose that the leakage current from the cell, due to the reverse-biased diode and subthreshold MOSFET currents, is no more than 2 pA. If a signal loss on the capacitor of 0.5 V can be tolerated, how often must the DRAM cell be refreshed to ensure that no data is lost?

Solution
0 0

A spacecraft starts from rest, and makes a journey to a destination 172000 km from its starting point. It does so by accelerating at a constant rate of 8.33 m/s^2 up to the midpoint of the journey, and then decelerates at the same constant rate of 8.33 m/s^2 for the second half of the journey, ending at rest. How long did the entire journey take? 5 hr 44 min 2 hr 52 min 2 hr 31 min 1 hr 47 min
Solution
0 0