Which instrument is used to measure altitudes in aircrafts- AltimeterThe temperature of the sun is measured with- Pyrometer
Thermometer used to measure very low temperature- Cryometer
Instrument used to measure change in volume of substances- Dilatometer
Instrument used to measure force & velocity of wind- Anemometer
Which waves are used in sonography- Ultrasonic waves
•Infrasonic Waves- (0 to 20 Hz)
•Audible waves – (20 to 20,000 Hz)
•Ultrasonic waves – (>20,000 Hz)
•SONAR stands for Sound Navigation And Ranging.
•The transmitter of a sonar produces pulses of ultrasonic sound waves of a frequency of about 50000 Hz.
•The size of atomic nucleus is- 10^-14 m
•What is used as a moderator in nuclear reactor- Graphite
•The temperature at which both the Fahrenheit and the centigrade scales have the same value-
•C/5 = (F-32)/9