Answer:
Explanation:
Given that:
Absolute temperature of the body,
- emissivity of the body,
<u>Using Stefan Boltzmann Law of thermal radiation:</u>
where:
(Stefan Boltzmann constant)
Now putting the respective values:
When laser light shines on a screen after passing through two closely spaced slits, it becomes
1 answer:
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Answer:
Explanation:
Let L be the length of the wire.
velocity of pulse wave v = L / 24.7 x 10⁻³ = 40.48 L m /s
mass per unit length of the wire m = 14.5 x 10⁻⁶ x 10⁻³ / 2 x 10⁻² kg / m
m = 7.25 x 10⁻⁷ kg / m
Tension in the wire = Mg , M is mass hanged from lower end.
= .4 x 9.8
= 3.92 N
expression for velocity of wave in the wire
, T is tension in the wire , m is mass per unit length of wire .
40.48 L =
1638.63 L² = 3.92 / (7.25 x 10⁻⁷)
L² = 3.92 x 10⁷ / (7.25 x 1638.63 )
L² = 3299.64
L = 57.44 m /s
<span>Assuming pulley is frictionless. Let the tension be ‘T’. See equation below.</span>
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