WEBVTT FILE

1
00:00:00.434 --> 00:00:05.072
Music

2
00:00:05.072 --> 00:00:08.942
The James Webb Space Telescope's
mirrors and instruments,

3
00:00:08.942 --> 00:00:13.180
Music

4
00:00:13.180 --> 00:00:16.984
kept clean inside a four story
tall tent,

5
00:00:16.984 --> 00:00:25.125
Music

6
00:00:25.125 --> 00:00:27.494
are moved into the Acoustic Test
Chamber at ...

7
00:00:27.494 --> 00:00:30.964
NASA's Goddard Space Flight
Center, in Greenbelt MD.


8
00:00:30.964 --> 00:00:36.136
Music

9
00:00:36.136 --> 00:00:37.638
Engineers blast the telescope
with acoustic energy, which ...

10
00:00:37.638 --> 00:00:40.307
results in vibrations similar to
what it will ...

11
00:00:40.307 --> 00:00:42.042
experince during launch.

12
00:00:42.042 --> 00:00:43.143
Music

13
00:00:43.143 --> 00:00:49.283
The telescope is tested to
frequencies as low as 20 Hertz

14
00:00:49.283 --> 00:00:56.390
and as high as 2800 Hertz ...

15
00:00:56.390 --> 00:01:02.029
and sound pressures as high as
142 decibels.

16
00:01:02.029 --> 00:01:05.098
Music

17
00:01:05.098 --> 00:01:07.601
This is louder than the decibel
level ...

18
00:01:07.601 --> 00:01:10.971
of a jet engine at takeoff.

19
00:01:10.971 --> 00:01:13.106
Music

20
00:01:13.106 --> 00:01:15.509
Instant hearing damage would
occur at this level without ...


21
00:01:15.509 --> 00:01:20.113
hearing protection. Eardrum
rupture occurs at 150 decibels.

22
00:01:20.113 --> 00:01:22.115
Engineers use this test to
ensure the Ariane 5 rocket's ...

23
00:01:22.115 --> 00:01:24.251
sound will not damage Webb's
structure ...

24
00:01:24.251 --> 00:01:26.119
or systems during launch.

25
00:01:26.119 --> 00:01:28.322
Music

26
00:01:28.322 --> 00:01:34.328
Beep ... Beep ... Beep