A piece of blue glass heated to a high temperature and a piece of red glass at room temperature, are taken inside a dimly lit room, then
the blue piece will look blue and red will look as usual
red looks bnghter red and blue looks ordinary blue
blue shines like brighter red compared to the red piece
both the pieces will look equally red
The wavelength of the radiation emitted by a body depends upon
the nature of the surface
the area of the surface
the temperature of the surface
all of the above factors
An ideal monoatomic gas is taken around the cycle ABCDA as shown in the PV diagram. The work done during the cycle is given by
PV
2 PV
4 PV
Infrared radiation was discovered in 1800 by
William Wollaston
William Herschel
Wilhelm Roentgen
Thomas Young
B.
William Herschel
Infrared radiation was discovered in 1800 by William Herschel.
A particle on the trough of a wave at any instant will come to the mean position after a time (T = time period)
T/2
T/4
T
2T
The disc of a siren containing 60 holes rotates at a constant speed of 360 rpm. The emitted sound is in unison with a tuning fork of frequency
10 Hz
360 Hz
216 Hz
60 Hz
In an experiment with sonometer a tuning fork of frequency 256 Hz resonates with a length of 25 cm and another tuning fork resonates with a length of 16 cm. Tension of the string remaining constant the frequency of the second tuning fork is
163.84 Hz
400 Hz
320 Hz
204.8 Hz
The apparent frequency of a note is 200 Hz, when a listener is moving wIth a velocity of 40 ms-1 towards a stationary source. When he moves away from the same source with the same speed, the apparent frequency of the same note is 160 Hz. The velocity of sound in air in m/s is
340
330
360
320