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Mrrafil [7]
3 years ago
7

You are heating two chunks of metal of the same size and shape. One is made of lead and is heated

Physics
1 answer:
olga55 [171]3 years ago
8 0

Answer:

This question is incomplete without the options but the options are provided below

(a) the two spectra peak at the same wavelength

(b) the spectra cannot be compared because they come from different materials

(c) The lead spectrum peak is at a shorter wavelength than the iron spectrum peak

(d) the lead spectrum peak is at a longer wavelength than the iron spectrum peak

The correct option is c

Explanation:

This question on quantum physics seek to test our knowledge of Wien's displacement law which states that when different temperatures (in kelvin) of a black body radiator increases, they will peak at different wavelengths which are inversely proportional to the temperature. Hence, <u>an increase in temperature of a black-body object will peak at a shorter wavelength than the other black-body object with a lesser temperature; since the lead was heated to 400 K, it's spectrum will peak at a shorter wavelength than that of iron which was heated to 350 K.</u>

Hence, the correct option is c

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If a 6V battery is connected to a light bulb whose resistance is 55,000Ω How much current will flow in the circuit?
notka56 [123]

Answer:

Current, I = 0.000109 Amps

Explanation:

Given the following data;

Voltage = 6V

Resistance = 55,000 Ohms

To find the current flowing through the circuit;

Ohm's law states that at constant temperature, the current flowing in an electrical circuit is directly proportional to the voltage applied across the two points and inversely proportional to the resistance in the electrical circuit.

Mathematically, Ohm's law is given by the formula;

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I represents current measured in amperes.

R represents resistance measured in ohms.

Making current the subject of formula, we have;

I = \frac {V}{R}

Substituting into the formula, we have;

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5 0
3 years ago
A 55 kg track and field athlete has an average power output of 5.4 kW during the 200 meter dash. How quickly did she finish the
olga_2 [115]

The time taken for the athlete to finish the race is 20 s (Option A)

<h3>What is power? </h3>

Power is simply defined as the rate at which work is done. It can be expressed mathematically as

Power (P) = work (W) / time (t)

But

Work = weight × distance

Therefore,

Power = (weight × distance ) / time

<h3>How to determine the time </h3>
  • Mass (m) = 55 Kg
  • Acceleration due to gravity (g) = 9.8 m/s²
  • Weight = mg = 55 × 9.8 = 539 N
  • Power (P) = 5.4 KW = 5.4 × 1000 = 5400 W
  • Distance (d) = 200 m
  • Time (t) =?

Power = (weight × distance ) / time

5400 = (539 × 200) / t

5400 = 107800 / t

Cross multiply

5400 × t = 107800

Divide both side by 5400

t = 107800 / 5400

t = 20 s

Learn more about power:

brainly.com/question/5684937

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